chore: pin GitHub Actions to SHAs and drop persisted tokens

.changeset/harden-gh-actions.md

@@ -0,0 +1,2 @@
+---
+---

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    groups:
+      github-actions:
+        patterns:
+          - "*"

.github/workflows/api-check.yml

@@ -15,13 +15,14 @@ jobs:
   api-check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
+          persist-credentials: false
           fetch-depth: 0
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: "24"
           cache: "pnpm"
@@ -51,7 +52,7 @@ jobs:
         continue-on-error: true
 
       - name: Comment on PR
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
         with:
           script: |
             const fs = require('fs');

.github/workflows/pkg-pr-new.yml

@@ -14,13 +14,14 @@ jobs:
   publish:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
+          persist-credentials: false
           fetch-depth: 0
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: "24"
           cache: "pnpm"

.github/workflows/publish-preview.yml

@@ -21,13 +21,14 @@ jobs:
           - "26"
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
+          persist-credentials: false
           fetch-depth: 0
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: ${{ matrix.node-version }}
           cache: "pnpm"

.github/workflows/release.yml

@@ -17,13 +17,16 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      # Persisted credentials are intentionally kept on this checkout so the
+      # subsequent `changesets/action` step can push the Version PR back to
+      # the repo using GITHUB_TOKEN.
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0
 
-      - uses: pnpm/action-setup@v4
+      - uses: pnpm/action-setup@b906affcce14559ad1aafd4ab0e942779e9f58b1 # v4
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: "24"
           cache: "pnpm"
@@ -35,7 +38,7 @@ jobs:
 
       - name: Create release PR or publish
         id: changesets
-        uses: changesets/action@v1
+        uses: changesets/action@63a615b9cd06ba9a3e6d13796c7fbcb080a60a0b # v1
         with:
           publish: pnpm release
           version: pnpm version

action.yml

@@ -140,7 +140,7 @@ runs:
 
     - name: Comment on PR
       if: inputs.comment == 'true' && github.event_name == 'pull_request'
-      uses: actions/github-script@v7
+      uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7
       with:
         github-token: ${{ inputs.github-token }}
         script: |