fix: use forgejo action mirrors, add pre-build compile and clippy checks

.forgejo/workflows/build-base.yaml

@@ -26,7 +26,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: https://github.com/actions/checkout@v4
+        uses: https://code.forgejo.org/actions/checkout@v4
 
       - name: Generate image tag
         id: tag

.forgejo/workflows/build-grid-rs.yaml

@@ -23,7 +23,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: https://github.com/actions/checkout@v4
+        uses: https://code.forgejo.org/actions/checkout@v4
 
       - name: Generate image tag
         id: tag
@@ -33,6 +33,17 @@ jobs:
           TAG="main-${TIMESTAMP}-${SHORT_SHA}"
           echo "tag=${TAG}" >> $GITHUB_OUTPUT
 
+      - name: Install Rust toolchain
+        run: |
+          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain stable
+          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+
+      - name: Run clippy and tests
+        working-directory: rust/prop_grid_rs
+        run: |
+          cargo clippy --all-targets -- -D warnings
+          cargo test --release
+
       - name: Build and push via Kaniko
         uses: graham/infra/.forgejo/actions/kaniko-build@main
         with:

.forgejo/workflows/build.yaml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: https://github.com/actions/checkout@v4
+        uses: https://code.forgejo.org/actions/checkout@v4
 
       - name: Generate image tag
         id: tag
@@ -30,6 +30,21 @@ jobs:
           TAG="main-${TIMESTAMP}-${SHORT_SHA}"
           echo "tag=${TAG}" >> $GITHUB_OUTPUT
 
+      - name: Verify compilation
+        run: |
+          docker run --rm \
+            -v ${{ github.workspace }}:/app \
+            -w /app \
+            -e MIX_ENV=prod \
+            docker.io/hexpm/elixir:1.20.1-erlang-29.0.2-debian-trixie-20260518-slim \
+            sh -c '\
+              mix local.hex --force && \
+              mix local.rebar --force && \
+              mix deps.get --only prod && \
+              mix deps.compile && \
+              mix assets.setup && \
+              mix compile --warnings-as-errors'
+
       - name: Build and Push via Kaniko
         uses: graham/infra/.forgejo/actions/kaniko-build@main
         with: