Add release workflow

.github/workflows/release.yml

@@ -0,0 +1,71 @@
+name: Create release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  check-versions:
+    runs-on: ubuntu-latest
+    outputs:
+      TAG_NAME: ${{ env.TAG_NAME }}
+      VERSION: ${{ steps.get_version.outputs.version }}
+    steps:
+      - name: Get tag name
+        run: |
+          echo "TAG_NAME=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      # Download artifacts from build workflow
+      - name: Download workflow artifacts
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow: build.yml
+          commit: ${{ github.sha }}
+          path: '.'
+
+      # Get publish.gradle version
+      - name: Get publish.gradle version
+        id: get_version
+        run: |
+          echo "version=$(cat version/version.txt)" >> $GITHUB_OUTPUT
+          echo "expectedTagName=v$(cat version/version.txt)" >> $GITHUB_OUTPUT
+
+      # Check publish.gradle version
+      - name: publish.gradle version check FAILED
+        if: ${{ steps.get_version.outputs.expectedTagName != env.TAG_NAME }}
+        run: |
+          echo Tag name: ${{ env.TAG_NAME }}
+          echo publish.gradle version: ${{ steps.get_version.outputs.version }}
+          exit 1
+
+  prepare-release:
+    runs-on: ubuntu-latest
+    needs: check-versions
+    steps:
+      # Download API, docs, and version.txt
+      - name: Download workflow artifacts
+        uses: dawidd6/action-download-artifact@v2
+        with:
+          workflow: build.yml
+          commit: ${{ github.sha }}
+          path: './artifacts'
+
+      # Create new release draft
+      - name: Create release
+        id: create_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          VERSION=${{ needs.check-versions.outputs.version }}
+          TAG=v$VERSION
+          gh release create $TAG --draft --title "Version $VERSION"
+          
+          echo "Sleep after creating release to avoid race condition"
+          sleep 5
+          
+          gh release upload $TAG CANBridge-${{ github.sha }}/*

README.md

@@ -32,8 +32,11 @@ cannot run the tests because they depend on having a USB CAN device connected.
 
 1. Bump the version number in `publish.gradle` and `CANBridge.json`
 2. Commit the version bump
-3. Create a new tag at that commit
+3. Create a new tag named `vX.X.X` at that commit
 4. Push the tag to GitHub
+5. Wait for the draft release to be created
+6. Add release notes to the draft release
+7. Publish the draft release
 
 ## Changelog