Add docker file

.gitea/workflows/deploy.yaml

@@ -7,26 +7,18 @@ on:
 jobs:
   build:
     runs-on: ubuntu-latest
-    container:
-      # Bigger container: Ubuntu with Python preinstalled
-      image: ubuntu:22.04
     steps:
-      # 1️⃣ Checkout the repository
       - name: Checkout repository
         uses: actions/checkout@v4
 
-      # 2️⃣ Install Python, pip, and MkDocs
-      - name: Setup Python and MkDocs
+      - name: Build docker image
         run: |
-          apt-get update
-          apt-get install -y python3 python3-pip git curl
-          pip3 install --upgrade pip
-          pip3 install mkdocs mkdocs-material pymdown-extensions
+          docker build -t mkdocs-builder -f ci/mkdocs/Dockerfile ci/mkdocs
 
-      # 3️⃣ Build MkDocs site to /public (mapped to Docker volume)
-      - name: Build MkDocs
-        run: mkdocs build --site-dir /public
-
-      # 4️⃣ Verify output
-      - name: Verify output
-        run: ls -l /public
+      - name: Build MKDocs output into shared volume
+        run: |
+          docker run --rm \
+            -v "$PWD:/work" -w /work \
+            -v notes_public:/public \
+            mkdocs-builder \
+            mkdocs build --clean --site-dir /public