diff --git a/.github/workflows/delete_untagged.py b/.github/workflows/delete_untagged.py
new file mode 100755
index 0000000..c89492e
--- /dev/null
+++ b/.github/workflows/delete_untagged.py
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+import requests
+import types
+
+parser = argparse.ArgumentParser()
+parser.add_argument("token", help="GitHub token")
+args = parser.parse_args()
+
+domain = "api.github.com"
+org = "BNLNPPS"
+package_type = "container"
+package_name = "esi-opticks"
+
+api_url = f"https://{domain}/orgs/{org}/packages/{package_type}/{package_name}/versions"
+
+respjson = requests.get(api_url, auth=("token", args.token))
+entries  = json.loads(respjson.text, object_hook=lambda d: types.SimpleNamespace(**d))
+
+for e in entries:
+    if not e.metadata.container.tags:
+        response = requests.delete(api_url + f"/{e.id}", auth=("token", args.token))
+        print("delete", e.id, e.html_url, e.name, response.url, response.status_code)
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
new file mode 100644
index 0000000..e5492ea
--- /dev/null
+++ b/.github/workflows/release.yml
@@ -0,0 +1,68 @@
+name: Release
+
+on:
+  push:
+    branches:
+      - semrel
+
+jobs:
+  build-test-release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Define environment variables
+        run: echo IMAGE_NAME=ghcr.io/$(echo ${{ github.repository }} | tr '[:upper:]' '[:lower:]') >> $GITHUB_ENV
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0  # Important for Semantic Release to analyze all commits
+
+      - name: Set up Docker buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build container
+        uses: docker/build-push-action@v5
+        with:
+          file: Dockerfile.test
+          tags: ${{ env.IMAGE_NAME }}:pre-semver
+          load: true
+          cache-from: ${{ env.IMAGE_NAME }}:latest
+
+      - name: Run tests
+        run: docker run ${{ env.IMAGE_NAME }}:pre-semver curl --version
+
+      - name: Semantic Release
+        uses: cycjimmy/semantic-release-action@v4
+        id: semantic
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Checkout code
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ steps.semantic.outputs.new_release_git_tag }}
+
+      - name: Login to GitHub container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build container
+        uses: docker/build-push-action@v5
+        with:
+          file: Dockerfile.test
+          tags: |
+            ${{ env.IMAGE_NAME }}:latest
+            ${{ env.IMAGE_NAME }}:${{ steps.semantic.outputs.new_release_version }}
+          push: true
+          cache-from: ${{ env.IMAGE_NAME }}:pre-semver
+
+  cleanup:
+    runs-on: ubuntu-latest
+    needs: build-test-release
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - run: .github/workflows/delete_untagged.py ${{ secrets.GITHUB_TOKEN }}
diff --git a/.releaserc.yaml b/.releaserc.yaml
new file mode 100644
index 0000000..5be77ac
--- /dev/null
+++ b/.releaserc.yaml
@@ -0,0 +1,15 @@
+# See https://semantic-release.gitbook.io/semantic-release/usage/configuration
+branches:
+  - semrel
+tagFormat: '${version}' # without this, the tag is prefixed with a 'v'
+plugins:
+  - "@semantic-release/commit-analyzer"
+  - "@semantic-release/release-notes-generator"
+  - "@semantic-release/changelog"
+  - path: "@semantic-release/npm"
+    npmPublish: false
+  - path: "@semantic-release/git"
+    assets:
+      - "CHANGELOG.md"
+      - "package.json"
+    message: "chore(release): ${nextRelease.version}\n\n${nextRelease.notes}"
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..5f29d33
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,56 @@
+## [1.1.4](https://github.com/BNLNPPS/esi-opticks/compare/1.1.3...1.1.4) (2024-04-25)
+
+
+### Bug Fixes
+
+* use github token ([4d8c086](https://github.com/BNLNPPS/esi-opticks/commit/4d8c08688d51d5f53df700a98d431280d576278a))
+
+## [1.1.3](https://github.com/BNLNPPS/esi-opticks/compare/1.1.2...1.1.3) (2024-04-25)
+
+
+### Bug Fixes
+
+* use token ([6b80ed1](https://github.com/BNLNPPS/esi-opticks/commit/6b80ed1da4f1c06bf4f55e158d9b4e0bfd57b98b))
+
+## [1.1.2](https://github.com/BNLNPPS/esi-opticks/compare/1.1.1...1.1.2) (2024-04-25)
+
+
+### Bug Fixes
+
+* make executable ([d324a4a](https://github.com/BNLNPPS/esi-opticks/commit/d324a4a8e23a9046a0835c2aaa36de224156b50d))
+
+## [1.1.1](https://github.com/BNLNPPS/esi-opticks/compare/1.1.0...1.1.1) (2024-04-25)
+
+
+### Bug Fixes
+
+* update permission ([57b9990](https://github.com/BNLNPPS/esi-opticks/commit/57b99906617e4360c511e4eeb06e8c7ffd4c5edc))
+
+# [1.1.0](https://github.com/BNLNPPS/esi-opticks/compare/1.0.0...1.1.0) (2024-04-25)
+
+
+### Features
+
+* delete untagged images ([2d5c4d5](https://github.com/BNLNPPS/esi-opticks/commit/2d5c4d55f92648441a60f49b900923bbc42c404d))
+
+# 1.0.0 (2024-04-25)
+
+
+### Bug Fixes
+
+* **build:** keep build cache dir ([#21](https://github.com/BNLNPPS/esi-opticks/issues/21)) ([d81672d](https://github.com/BNLNPPS/esi-opticks/commit/d81672d8f4a08532e2719851320ee9e3112cb5a5))
+* **esi-shell:** avoid building code (OptiX) on shell startup ([#23](https://github.com/BNLNPPS/esi-opticks/issues/23)) ([76320cf](https://github.com/BNLNPPS/esi-opticks/commit/76320cf6e8d43e37414d0469ae8f81c950f97231))
+* **esi-shell:** drop support for singularity with GPU (for now) ([#22](https://github.com/BNLNPPS/esi-opticks/issues/22)) ([4cb9d19](https://github.com/BNLNPPS/esi-opticks/commit/4cb9d19c3180ac66aab8d58a4e615cd4e0e6567e))
+* **esi-shell:** improve user experience ([#20](https://github.com/BNLNPPS/esi-opticks/issues/20)) ([0a464af](https://github.com/BNLNPPS/esi-opticks/commit/0a464af1dd9d01cedb98dd50b3f3681dbe73da22))
+* **esi-shell:** support only linux ([#13](https://github.com/BNLNPPS/esi-opticks/issues/13)) ([6cfb154](https://github.com/BNLNPPS/esi-opticks/commit/6cfb154d82fe252089b10ef92db3a63707c2a60b))
+* patch spack default modules.yaml ([#27](https://github.com/BNLNPPS/esi-opticks/issues/27)) ([23183af](https://github.com/BNLNPPS/esi-opticks/commit/23183af24648db3fdcdf0c5a9dc94385d9aa1b9c))
+* set compute capability to 5.2 compatible with Quadro M4000 ([#1](https://github.com/BNLNPPS/esi-opticks/issues/1)) ([b1d7513](https://github.com/BNLNPPS/esi-opticks/commit/b1d751357c61ac3e18a94262536ca397d1fa54e7))
+* simplify build workflow, leverage login scripts ([#8](https://github.com/BNLNPPS/esi-opticks/issues/8)) ([fd974b4](https://github.com/BNLNPPS/esi-opticks/commit/fd974b4c42dbcb8c1247cd262bafbf16e4eb071b))
+* use correct gdml file ([c014536](https://github.com/BNLNPPS/esi-opticks/commit/c014536e4452a815bef61a2b03bfe456a898bb7d))
+
+
+### Features
+
+* add esi-shell ([#6](https://github.com/BNLNPPS/esi-opticks/issues/6)) ([fa859aa](https://github.com/BNLNPPS/esi-opticks/commit/fa859aa91496b27fb66d891ef78a28ec90b45c50))
+* setup semantic release ([0515111](https://github.com/BNLNPPS/esi-opticks/commit/0515111b81f304db1014417a70a160fa5525c0b9))
+* upgrade opticks to main@b55f15bd ([#26](https://github.com/BNLNPPS/esi-opticks/issues/26)) ([946da36](https://github.com/BNLNPPS/esi-opticks/commit/946da36cdc7fe309c63a8547ca8aeeeb0551a313))
diff --git a/Dockerfile.test b/Dockerfile.test
new file mode 100644
index 0000000..e34109b
--- /dev/null
+++ b/Dockerfile.test
@@ -0,0 +1,7 @@
+# syntax=docker/dockerfile:latest
+
+FROM nvcr.io/nvidia/cuda:11.8.0-runtime-ubuntu22.04
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt update && apt install -y curl
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..e0f6bb8
--- /dev/null
+++ b/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "esi-opticks",
+  "version": "1.1.4",
+  "description": "esi shell project",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/BNLNPPS/esi-opticks.git"
+  },
+  "keywords": [],
+  "author": "BNL NPPS",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/BNLNPPS/esi-opticks/issues"
+  },
+  "homepage": "https://github.com/BNLNPPS/esi-opticks#readme",
+  "devDependencies": {
+    "@semantic-release/changelog": "^6.0.3",
+    "@semantic-release/commit-analyzer": "^12.0.0",
+    "@semantic-release/git": "^10.0.1",
+    "@semantic-release/release-notes-generator": "^13.0.0",
+    "semantic-release": "^23.0.8"
+  }
+}