ci: pin GitHub Actions to commit SHAs + add Dependabot

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/action-smoke.yml

@@ -15,8 +15,8 @@ jobs:
   block-must-fail:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: "3.12"
       - id: gate
@@ -40,8 +40,8 @@ jobs:
   out-of-scope-must-pass:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-python@v5
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
+      - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5
         with:
           python-version: "3.12"
       - uses: ./docs/action

.github/workflows/consistency.yml

@@ -22,10 +22,10 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39 # v3
         with:
           version: "0.11.6"
 

.github/workflows/release.yml

@@ -24,10 +24,10 @@ jobs:
     permissions:
       contents: read
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39 # v3
         with:
           version: "0.11.6"
 
@@ -60,10 +60,10 @@ jobs:
     # NOTE: if the PyPI Trusted Publisher was registered with an Environment name,
     # add a matching `environment:` block here. Registered without one -> omit it.
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39 # v3
         with:
           version: "0.11.6"
 
@@ -74,9 +74,9 @@ jobs:
         run: uv build
 
       - name: SLSA build provenance (verify with `gh attestation verify`)
-        uses: actions/attest-build-provenance@v1
+        uses: actions/attest-build-provenance@ef244123eb79f2f7a7e75d99086184180e6d0018 # v1
         with:
           subject-path: "dist/*"
 
       - name: Publish to PyPI (Trusted Publisher + PEP 740 attestations)
-        uses: pypa/gh-action-pypi-publish@release/v1
+        uses: pypa/gh-action-pypi-publish@cef221092ed1bacb1cc03d23a2d87d1d172e277b # release/v1

.github/workflows/secret-scan.yml

@@ -21,12 +21,12 @@ jobs:
     timeout-minutes: 10
     steps:
       # Full history so gitleaks scans every commit on a push, not just the tip.
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
         with:
           fetch-depth: 0
 
       - name: Run gitleaks
-        uses: gitleaks/gitleaks-action@v2
+        uses: gitleaks/gitleaks-action@ff98106e4c7b2bc287b24eaf42907196329070c7 # v2
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           # Polycentric-Labs is a GitHub Organization; gitleaks-action requires a

.github/workflows/test.yml

@@ -16,10 +16,10 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 10
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
 
       - name: Install uv
-        uses: astral-sh/setup-uv@v3
+        uses: astral-sh/setup-uv@caf0cab7a618c569241d31dcd442f54681755d39 # v3
         with:
           version: "0.11.6"