Apply pinning to GitHub Actions

.github/dependabot.yml

@@ -0,0 +1,16 @@
+version: 2
+
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+    groups:
+      actions:
+        patterns: ["*"]
+    ignore:
+      - dependency-name: "DeterminateSystems/*"
+    commit-message:
+      prefix: ci

.github/workflows/ci.yml

@@ -11,7 +11,9 @@ jobs:
       id-token: "write"
       contents: "read"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
       - uses: ./.
       - run: nix develop -c typos
         if: success() || failure()

.github/workflows/release.yml

@@ -25,7 +25,9 @@ jobs:
           shorttag=$(echo "$VERSION" | cut -d'.' -f1)
           echo "shorttag=$shorttag" >> "$GITHUB_OUTPUT"
 
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
       - name: Create the short tag
         env:
           SHORTTAG: ${{ steps.check_tag.outputs.shorttag }}

.github/zizmor.yml

@@ -0,0 +1,5 @@
+rules:
+  unpinned-uses:
+    config:
+      policies:
+        DeterminateSystems/*: ref-pin