Add Dockerfile and Forgejo Actions workflow for Docker builds

.forgejo/workflows/docker.yml

@@ -0,0 +1,38 @@
+name: Build and push Docker image
+
+on:
+  push:
+    branches:
+      - master
+      - testing
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set image tag
+        id: tag
+        run: |
+          if [ "${{ github.ref_name }}" = "master" ]; then
+            echo "tag=latest" >> $GITHUB_OUTPUT
+          else
+            echo "tag=${{ github.ref_name }}" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Log in to Forgejo registry
+        uses: docker/login-action@v3
+        with:
+          registry: fg.creamfresh.xyz
+          username: ${{ github.actor }}
+          password: ${{ secrets.FORGEJO_TOKEN }}
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          tags: fg.creamfresh.xyz/mrwnslz/diora-web:${{ steps.tag.outputs.tag }}

Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt gunicorn
+
+COPY . .
+
+RUN python manage.py collectstatic --noinput
+
+EXPOSE 8000
+
+CMD ["gunicorn", "diora.wsgi:application", "--bind", "0.0.0.0:8000", "--workers", "2"]