Add workflow to upload minimal Alpine container to GHCR

.github/workflows/container-upload.yml

@@ -0,0 +1,61 @@
+name: Build and Upload Container
+
+on:
+  # Manual trigger capability
+  workflow_dispatch:
+
+  # Trigger when Dockerfile is changed
+  push:
+    branches:
+      - master
+    paths:
+      - 'Dockerfile'
+
+  # Also build on PRs to test Dockerfile changes
+  pull_request:
+    paths:
+      - 'Dockerfile'
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to GitHub Container Registry
+        # Only login when pushing (on master branch)
+        if: github.ref == 'refs/heads/master'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=sha,prefix={{branch}}-,enable={{is_default_branch}}
+            type=sha
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          # Only push to registry on master branch, otherwise just build
+          push: ${{ github.ref == 'refs/heads/master' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+# vim:set sts=2:

Dockerfile

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+FROM alpine:latest
+
+# Create a timestamp file to make each build unique
+RUN echo "Built at: $(date -u '+%Y-%m-%d %H:%M:%S UTC')" > /timestamp.txt && \
+    cat /timestamp.txt
+
+# Add a simple healthcheck script
+RUN echo '#!/bin/sh' > /healthcheck.sh && \
+    echo 'cat /timestamp.txt' >> /healthcheck.sh && \
+    chmod +x /healthcheck.sh
+
+CMD ["/healthcheck.sh"]