add chisel template

.github/workflows/template-cleanup.yml

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+# Workflow to cleanup projects created from this template
+# Adapted from workflow of the same name in https://github.com/JetBrains/intellij-platform-plugin-template
+# SPDX-License-Identifier: Apache-2.0
+
+name: Template Cleanup
+on:
+  push:
+    branches: [main]
+
+jobs:
+  # Triggered on first push to repos created from the template
+  template-cleanup:
+    name: Template Cleanup
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    if: github.event.repository.name != 'chisel-template'
+    steps:
+
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          # These are needed to make ad-m/github-push-action work
+          # https://github.com/ad-m/github-push-action/tree/d91a481090679876dfc4178fef17f286781251df#example-workflow-file
+          persist-credentials: false
+          fetch-depth: 0
+
+      - name: Cleanup
+        run: |
+          export LC_CTYPE=C
+          export LANG=C
+
+          # Prepare variables
+          NAME="${GITHUB_REPOSITORY##*/}"
+          ORG="$GITHUB_REPOSITORY_OWNER"
+          SAFE_ORG=$(echo $ORG | sed 's/[^a-zA-Z0-9]//g' | tr '[:upper:]' '[:lower:]')
+          GROUP="com.github.$SAFE_ORG"
+
+          # Replace placeholders
+          sed -i "s/%NAME%/$NAME/g" build.sbt build.sc README.md src/test/scala/gcd/*
+          sed -i "s/%REPOSITORY%/${GITHUB_REPOSITORY/\//\\/}/g" README.md
+          sed -i "s/%ORGANIZATION%/$GROUP/g" build.sbt
+
+          # Remove lines marked with #REMOVE-ON-CLEANUP#
+          sed -i '/#REMOVE-ON-CLEANUP#/d' README.md
+
+          rm -rf \
+            .github/workflows/template-cleanup.yml \
+            LICENSE
+
+      - name: Commit
+        run: |
+          git config --local user.email "action@github.com"
+          git config --local user.name "GitHub Action"
+          git add .
+          git commit -m "Template cleanup"
+
+      - name: Push changes
+        uses: ad-m/github-push-action@v0.8.0
+        with:
+          branch: main
+          github_token: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/test.yml

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+name: Continuous Integration
+
+on:
+  push:
+    tags: ['*']
+    branches: ['main']
+  pull_request:
+  workflow_dispatch:
+
+env:
+  verilator-version: v5.012
+  verilator-install-dir: verilator-install
+
+jobs:
+  ci:
+    name: ci
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Cleanup
+        run: sed -i "s/%NAME%/test/g" build.sc
+      - name: Cache Scala
+        uses: coursier/cache-action@v6
+      - name: Setup Scala
+        uses: coursier/setup-action@v1
+        with:
+          jvm: adopt:11
+          apps: sbt mill
+      - name: Setup Dependencies
+        run: |
+          sudo apt-get install ccache
+      - name: Get Cached Verilator
+        id: get-cached-verilator
+        uses: actions/cache@v4
+        with:
+          path: ${{ env.verilator-install-dir }}
+          key: verilator-${{ env.verilator-version }}
+      - name: Install Verilator
+        if: steps.get-cached-verilator.outputs.cache-hit != 'true'
+        run: |
+          sudo apt-get install git help2man perl python3 make autoconf g++ flex bison numactl perl-doc libfl-dev
+          git clone https://github.com/verilator/verilator
+          unset VERILATOR_ROOT
+          cd verilator
+          git checkout ${{ env.verilator-version  }}
+          autoconf
+          ./configure --prefix=$(pwd)/../${{ env.verilator-install-dir }}
+          make
+          make install
+      - name: Set PATH
+        run: |
+          echo "$(pwd)/${{ env.verilator-install-dir }}/bin" >> $GITHUB_PATH
+          echo VERILATOR_ROOT="$(pwd)/${{ env.verilator-install-dir }}/share/verilator" >> $GITHUB_ENV
+          ln -sf $(pwd)/${{ env.verilator-install-dir }}/bin/verilator_bin $(pwd)/${{ env.verilator-install-dir }}/share/verilator/verilator_bin
+      - name: SBT Test
+        run: sbt test
+      - name: mill Test
+        run: mill _.test