release: Add manual workflow to release packages (#5)

.github/workflows/release.yml

@@ -0,0 +1,36 @@
+on:
+  workflow_dispatch:
+    input:
+      package:
+        description: "Package name"
+        required: true
+        type: choice
+        options:
+        - autoconf
+        - devcontainer
+
+job:
+  release-to-ghcr:
+    runs-on: ubuntu-latest
+    steps:
+      # Checkout push-to-registry action github repository
+      - name: Checkout Push to Registry action
+        uses: actions/checkout@v4
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login To GHCR
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: python
+          password: ${{secrets.GHCR_TOKEN}}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: ./${{ inputs.package }}
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: |
+            ghcr.io/python/${{ inputs.package }}:latest