CI: bump actions, add ubuntu 26.04, dependabot, zizmor, actionlint

.github/actionlint.yaml

@@ -0,0 +1,5 @@
+# ubuntu-26.04 is still in public preview, and actionlint does not know
+# about it yet; remove this once it does.
+self-hosted-runner:
+  labels:
+    - ubuntu-26.04

.github/dependabot.yml

@@ -0,0 +1,13 @@
+version: 2
+
+updates:
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+    groups:
+      github-actions:
+        patterns:
+          - "*"

.github/workflows/actionlint.yml

@@ -0,0 +1,26 @@
+name: Actionlint
+
+# Default to 'contents: read', which grants actions to read commits.
+#
+# If any permission is set, any permission not included in the list is
+# implicitly set to "none".
+#
+# see https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#permissions
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+on: [push, pull_request]
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 10 # guardrails timeout for the whole job
+    steps:
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      with:
+        persist-credentials: false
+    - uses: devops-actions/actionlint@ec02b36684b2f574f1d219ad0a43b082e46bf3e4 # v0.1.13

.github/workflows/test.yml

@@ -20,17 +20,19 @@ jobs:
     strategy:
       matrix:
         go-version: [1.18.x, oldstable, stable]
-        platform: [ubuntu-22.04, ubuntu-24.04, windows-2022, windows-2025, macos-15, macos-26]
+        platform: [ubuntu-22.04, ubuntu-24.04, ubuntu-26.04, windows-2022, windows-2025, macos-15, macos-26]
     runs-on: ${{ matrix.platform }}
     timeout-minutes: 10 # guardrails timeout for the whole job
     defaults:
       run:
         shell: bash
     steps:
     - name: Checkout code
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      with:
+        persist-credentials: false
     - name: Install Go
-      uses: actions/setup-go@4b73464bb391d4059bd26b0524d20df3927bd417 # v6.3.0
+      uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
       with:
         go-version: ${{ matrix.go-version }}
         # Disable caching as we don't have top-level go.sum needed for
@@ -87,14 +89,31 @@ jobs:
         uname -a
         make test
     - name: Send to Codecov
-      uses: codecov/codecov-action@1af58845a975a7985b0beb0cbe6fbbb71a41dbad # v5.5.3
+      uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
       with:
         token: ${{ secrets.CODECOV_TOKEN }}  # used to upload coverage reports: https://github.com/moby/buildkit/pull/4660#issue-2142122533
 
   codespell:
     runs-on: ubuntu-24.04
     timeout-minutes: 10 # guardrails timeout for the whole job
     steps:
-    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-    - run: pip install --break-system-packages codespell==v2.3.0
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      with:
+        persist-credentials: false
+    - run: pip install --break-system-packages codespell==v2.4.3
     - run: codespell
+
+  zizmor:
+    runs-on: ubuntu-24.04
+    timeout-minutes: 10 # guardrails timeout for the whole job
+    steps:
+    - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+      with:
+        persist-credentials: false
+    - uses: zizmorcore/zizmor-action@3dc1ecc9bcb9e94e9b2c709687979e1298497054 # v0.6.2
+      with:
+        # Report findings as workflow annotations rather than uploading
+        # them to the repository's security tab (which needs additional
+        # permissions and GitHub Advanced Security to be enabled).
+        advanced-security: false
+        annotations: true