Add automatic creation of GH release to CI

.github/workflows/ci.yml

@@ -27,3 +27,49 @@ jobs:
         uses: codecov/codecov-action@v4
         with:
           directory: .
+
+      - name: Upload built JAR
+        uses: actions/upload-artifact@v4
+        with:
+          name: jmail-jar
+          path: target/jmail-*.jar
+
+  create-release:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags/')
+    needs: [ build ]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Download JAR
+        uses: actions/download-artifact@v4
+        with:
+          name: jmail-jar
+          path: target
+
+      - name: Set tag number
+        id: tag
+        run: echo "tag_name=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT
+
+      - name: Create release notes file
+        run: sed '/^## ${{ steps.tag.outputs.tag_name }}/,/^---/!d;//d' CHANGELOG.md > release_body.md
+
+      - name: Create GitHub Release
+        id: create_release
+        uses: actions/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          body_path: release_body.md
+
+      - name: Upload JAR to Release
+        uses: actions/[email protected]
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: target/jmail-${{ steps.tag.outputs.tag_name }}.jar
+          asset_name: jmail-${{ steps.tag.outputs.tag_name }}.jar
+          asset_content_type: application/java-archive