ci: pin actions to SHA and add minimal permissions

Author: bug3

.github/workflows/ci.yml

@@ -6,15 +6,18 @@ on:
   pull_request:
     branches: [master]
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest
     strategy:
       matrix:
         node-version: [20, 22]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: ${{ matrix.node-version }}
           cache: npm

.github/workflows/release.yml

@@ -11,7 +11,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
       - run: gh release create ${{ github.ref_name }} --generate-notes
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}