Add Dockerfile and github actions infra

.github/workflows/docker-publish.yml

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+name: Publish Docker Image
+
+on:
+  push:
+    branches: ['main']
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+
+      - name: Buildah Action
+        id: build_image
+        uses: redhat-actions/buildah-build@v2
+        with:
+          image: ${{ env.IMAGE_NAME }}
+          tags: ${{ steps.meta.outputs.tags }}
+          oci: true
+          containerfiles: |
+            ./Dockerfile
+
+      - name: Push To GHCR
+        uses: redhat-actions/push-to-registry@v2
+        with:
+          tags: ${{ steps.build_image.outputs.tags }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}

Dockerfile

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+# docker manifest inspect postgis/postgis:latest -v | jq '.Descriptor.digest'
+FROM postgis/postgis:latest@sha256:e006d19de59fb489e380d4b3ca1eff8f3c905785906641a131cad9cb27e981ca
+
+RUN apt-get update \
+ && apt-get install -y --no-install-recommends \
+      rsync \
+ && apt-get autoremove --purge -y \
+ && apt-get autoclean -y \
+ && rm -rf /var/lib/apt/lists/*