Derive Docker dev version from git metadata

.github/workflows/docker-publish.yml

@@ -15,6 +15,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
@@ -22,6 +24,18 @@ jobs:
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Compute package version
+        id: package_version
+        run: |
+          python -m pip install --disable-pip-version-check setuptools_scm
+          version="$(python -m setuptools_scm)"
+          echo "version=${version}" >> "$GITHUB_OUTPUT"
+
       - name: Log in to Docker Hub
         uses: docker/login-action@v3
         with:
@@ -45,6 +59,8 @@ jobs:
           file: ./dockerfile
           platforms: linux/amd64,linux/arm64
           push: true
+          build-args: |
+            PACKAGE_VERSION=${{ steps.package_version.outputs.version }}
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
           cache-from: type=gha

dockerfile

@@ -1,10 +1,12 @@
 FROM python:3.12-slim-bookworm
 
+ARG PACKAGE_VERSION=1.0.5
+
 ENV INSTALL_DIR=/opt/pymc_repeater \
     CONFIG_DIR=/etc/pymc_repeater \
     DATA_DIR=/var/lib/pymc_repeater \
     PYTHONUNBUFFERED=1 \
-    SETUPTOOLS_SCM_PRETEND_VERSION_FOR_PYMC_REPEATER=1.0.5
+    SETUPTOOLS_SCM_PRETEND_VERSION_FOR_PYMC_REPEATER=${PACKAGE_VERSION}
 
 # Install runtime dependencies only
 RUN apt-get update && apt-get install -y \