Add GH Action to push to Docker Registry (#1105)

* Add GH Action to push to Docker Registry

* Update CHANGELOG.md

.github/workflows/docker.yml

@@ -0,0 +1,51 @@
+name: docker
+
+on:
+  push:
+    tags:
+    - 'v[0-9]+.[0-9]+.[0-9]+' # ignore rc
+
+env:
+  DOCKER_REPOSITORY: osmolabs/osmosis
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - 
+        name: Check out the repo
+        uses: actions/checkout@v2
+      - 
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+      - 
+        name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+      - 
+        name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      -
+        name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v3
+        with:
+          images: ${{ env.DOCKER_REPOSITORY }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+      - 
+        name: Build and push
+        uses: docker/build-push-action@v2
+        with:
+          file: Dockerfile
+          context: .
+          push: true
+          platforms: linux/amd64
+          tags: ${{ steps.meta.outputs.tags }}
+      - 
+        name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

CHANGELOG.md

@@ -46,6 +46,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * [#1061](https://github.com/osmosis-labs/osmosis/pull/1061) upgrade iavl to v0.17.3-osmo-v5 with concurrent map write fix
 * [#1071](https://github.com/osmosis-labs/osmosis/pull/1071) improve Dockerfile
 * [#1095](https://github.com/osmosis-labs/osmosis/pull/1095) Fix authz being unable to use lockup & superfluid types.
+* [#1105](https://github.com/osmosis-labs/osmosis/pull/1105) Add GitHub Actions to automatically push the osmosis Docker image 
 
 ### SDK fork updates