Add workflow for (1) drafting release, (2) uploading Docker images

.github/workflows/docker-image-release.yml

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+name: Release Docker images
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    if: github.event_name == 'release' && github.event.prerelease == false
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Build JARs
+        run: mvn $MAVEN_CLI_OPTS package
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push Knowledge Directory Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./knowledge-directory
+          platforms: linux/amd64, linux/arm64
+          tags: ghcr.io/tno/knowledge-engine/knowledge-directory:${{ github.event.release.tag_name }}
+          push: true
+      - name: Build and push Smart Connector Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./smart-connector-rest-dist
+          platforms: linux/amd64, linux/arm64
+          tags: ghcr.io/tno/knowledge-engine/smart-connector:${{ github.event.release.tag_name }}
+          push: true
+      - name: Build and push Admin UI Docker image
+        uses: docker/build-push-action@v6
+        with:
+          context: ./admin-ui
+          platforms: linux/amd64, linux/arm64
+          tags: ghcr.io/tno/knowledge-engine/admin-ui:${{ github.event.release.tag_name }}
+          push: true

.github/workflows/draft-release.yml

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+name: Make draft release
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: "Version for new release (X.Y.Z)"
+        required: true
+        type: string
+
+env:
+  MAVEN_OPTS: -Dhttps.protocols=TLSv1.2 -Dmaven.repo.local=$CI_PROJECT_DIR/.m2/repository -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=WARN -Dorg.slf4j.simpleLogger.showDateTime=true -Djava.awt.headless=true
+  MAVEN_CLI_OPTS: --batch-mode --errors --fail-at-end --show-version
+
+jobs:
+  setup:
+    runs-on: ubuntu-latest
+    container:
+      image: maven:3.9.9-eclipse-temurin-17-focal
+      options: --user 1001
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build JARs
+        run: mvn $MAVEN_CLI_OPTS package
+      - name: Create tag
+        run: |
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git config user.name "github-actions[bot]"
+          git tag -a ${{ inputs.version }} -m ${{ inputs.version }}
+          git push origin ${{ inputs.version }}
+      - name: Draft release
+        uses: softprops/action-gh-release@v2
+        with:
+          files: |
+            smart-connector-rest-dist-${{ inputs.version }}-with-dependencies.jar
+            knowledge-directory-${{ inputs.version }}-with-dependencies.jar
+          tag_name: ${{ inputs.version }}
+          draft: true
+          generate_release_notes: true
+          make_latest: true