chore(ci): automated release workflows

.github/workflows/release-build.yaml

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+# SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company
+# SPDX-License-Identifier: Apache-2.0
+
+name: Release
+
+on:
+  release:
+    types:
+      - created
+
+permissions:
+  contents: read
+  packages: write
+
+env:
+  REGISTRY: ghcr.io
+
+jobs:
+  build-and-push-image:
+    name: Build and push container image
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v6
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@ce360397dd3f832beb865e1373c09c0e9f86d70a # v4.0.0
+
+      # Set up BuildKit Docker container builder to be able to build
+      # multi-platform images and export cache
+      # https://github.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@4d04d5d9486b7bd6fa91e7baf45bbb4f8b9deedd # v4.0.0
+        with:
+          driver-opts: |
+            image=moby/buildkit:latest
+
+      # Login against a Docker registry except on PR
+      # https://github.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121 # v4.1.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      # Extract metadata (tags, labels) for Docker
+      # https://github.com/docker/metadata-action
+      - name: Extract Docker metadata
+        id: meta
+        uses: docker/metadata-action@030e881283bb7a6894de51c315a6bfe6a94e05cf # v6.0.0
+        with:
+          images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/shoot-grafter
+          tags: |
+            type=semver,pattern={{version}},prefix=v
+            type=semver,pattern={{major}}.{{minor}},prefix=v
+            type=semver,pattern={{major}},enable=${{ !startsWith(github.ref, 'refs/tags/v0.') }},prefix=v
+            type=ref,event=branch
+            type=ref,event=tag
+            type=ref,event=pr
+            type=schedule
+            type=raw,value=${{ github.sha }}
+            type=sha,enable=true,format=short,prefix=
+            type=edge,branch=master
+
+      # Build and push Docker image with Buildx (don't push on PR)
+      # https://github.com/docker/build-push-action
+      - name: Build and push Docker image
+        id: build-and-push
+        uses: docker/build-push-action@bcafcacb16a39f128d818304e6c9c0c18556b85f # v7.1.0
+        with:
+          context: .
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          # remove untagged images produced for multi platform builds
+          provenance: false
+          #  cache-from: type=gha
+          #  cache-to: type=gha,mode=max
+          platforms: |
+            linux/amd64
+
+  notify-extensions:
+    name: Notify greenhouse-extensions
+    runs-on: ubuntu-latest
+    needs: build-and-push-image
+    permissions:
+      contents: read
+    steps:
+      - name: Generate GitHub App token
+        id: app-token
+        uses: actions/create-github-app-token@v3
+        with:
+          app-id: ${{ vars.APP_ID }}
+          private-key: ${{ secrets.APP_PRIVATE_KEY }}
+          repositories: greenhouse-extensions
+          permission-contents: write
+
+      - name: Repository dispatch to greenhouse-extensions
+        uses: peter-evans/repository-dispatch@v3
+        with:
+          token: ${{ steps.app-token.outputs.token }}
+          repository: abhijith-darshan/greenhouse-extensions
+          event-type: plugin_release
+          client-payload: |
+            {
+              "plugin_definition": "shoot-grafter",
+              "version": "${{ github.event.release.tag_name }}"
+            }

.github/workflows/release.yaml

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+# SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company
+# SPDX-License-Identifier: Apache-2.0
+
+name: Release Auto
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: Release version (e.g. v0.3.0)
+        required: true
+        default: v0.3.0
+
+permissions:
+  contents: write
+
+jobs:
+  create-release:
+    name: Create GitHub release
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v6
+
+      - name: Create release and generate release notes
+        uses: actions/github-script@v8
+        with:
+          script: |
+            await github.rest.repos.createRelease({
+              owner: context.repo.owner,
+              repo: context.repo.repo,
+              tag_name: '${{ github.event.inputs.version }}',
+              target_commitish: context.sha,
+              name: '${{ github.event.inputs.version }}',
+              generate_release_notes: true,
+              draft: false,
+              prerelease: false
+            })