ci: remove external action dependencies

.gitea/workflows/ci.yml

@@ -36,7 +36,17 @@ jobs:
       EXPECTED_EXTERNAL_TESTS: '10'
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        env:
+          GITEA_JOB_TOKEN: ${{ gitea.token }}
+        run: |
+          set -Eeuo pipefail
+          auth="$(printf 'x-access-token:%s' "$GITEA_JOB_TOKEN" | base64 | tr -d '\n')"
+          git init .
+          git remote add origin "${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}.git"
+          git -c http.extraHeader="Authorization: Basic ${auth}" \
+            fetch --no-tags --depth=1 origin "$GITHUB_REF"
+          git checkout --detach "$GITHUB_SHA"
+          test "$(git rev-parse HEAD)" = "$GITHUB_SHA"
 
       - name: Verify migration line endings
         run: |
@@ -54,10 +64,16 @@ jobs:
           PY
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: '1.92'
-          components: rustfmt, clippy
+        run: |
+          set -Eeuo pipefail
+          curl --proto '=https' --tlsv1.2 --fail --silent --show-error \
+            --location --retry 10 --retry-connrefused https://sh.rustup.rs \
+            | sh -s -- -y --default-toolchain none --profile minimal
+          /root/.cargo/bin/rustup toolchain install 1.92 \
+            --profile minimal --component rustfmt --component clippy --no-self-update
+          /root/.cargo/bin/rustup default 1.92
+          echo /root/.cargo/bin >> "$GITHUB_PATH"
+          /root/.cargo/bin/rustc --version --verbose
 
       - name: Check Rust formatting
         run: cargo fmt --all -- --check
@@ -78,11 +94,9 @@ jobs:
         run: cargo audit
 
       - name: Install Node.js
-        uses: actions/setup-node@v4
-        with:
-          node-version: '22'
-          cache: npm
-          cache-dependency-path: frontend/package-lock.json
+        run: |
+          node --version | grep --extended-regexp '^v22\.'
+          npm --version
 
       - name: Build frontend
         working-directory: frontend