Build cffi and pyyaml from source (#222)

.github/workflows/container-test.yml

@@ -0,0 +1,54 @@
+---
+name: Build and test container image
+
+# yamllint disable-line rule:truthy
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+    paths:
+      - 'Dockerfile'
+      - 'requirements.txt'
+      - 'setup.py'
+
+jobs:
+  test:
+    strategy:
+      matrix:
+        include:
+          - platform: 'linux/arm64'
+            tag: prometheus-pve-exporter:develop-arm64
+            smoketest: false
+          - platform: 'linux/amd64'
+            tag: prometheus-pve-exporter:develop-amd64
+            smoketest: true
+
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout repository
+        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: Build Docker image (all architectures)
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          load: true
+          platforms: ${{ matrix.platform }}
+          tags: ${{ matrix.tag }}
+
+      - name: Container image smoketest
+        if: ${{ matrix.smoketest }}
+        run: docker run --rm ${{ matrix.tag }} --help

Dockerfile

@@ -1,15 +1,30 @@
-FROM alpine:3.19.0
-RUN apk update && apk upgrade
+FROM alpine:3.19.0 as base
 
-RUN apk add --no-cache \
+FROM base as build
+RUN apk update && apk add --no-cache \
+    build-base \
     ca-certificates \
+    libffi-dev \
+    py3-build \
     py3-pip \
-    python3
+    python3 \
+    python3-dev \
+    yaml-dev
 
 ADD . /src/prometheus-pve-exporter
+WORKDIR /src/prometheus-pve-exporter
+RUN python3 -m pip wheel -w dist --no-binary "cffi" --no-binary "pyyaml" -r requirements.txt && \
+    python3 -m build .
+
+FROM base
+RUN apk update && apk add --no-cache \
+    ca-certificates \
+    py3-pip \
+    python3
+
+COPY --from=build /src/prometheus-pve-exporter/dist /src/prometheus-pve-exporter/dist
 RUN python3 -m venv /opt/prometheus-pve-exporter && \
-    /opt/prometheus-pve-exporter/bin/pip install -r /src/prometheus-pve-exporter/requirements.txt && \
-    /opt/prometheus-pve-exporter/bin/pip install /src/prometheus-pve-exporter && \
+    /opt/prometheus-pve-exporter/bin/pip install /src/prometheus-pve-exporter/dist/*.whl && \
     ln -s /opt/prometheus-pve-exporter/bin/pve_exporter /usr/bin/pve_exporter && \
     rm -rf /src/prometheus-pve-exporter /root/.cache