ci: add codeql code scanning and remove GitHub variable usages (#297)

.github/workflows/automerge-dependabot.yaml

@@ -8,7 +8,7 @@ permissions:
 
 jobs:
   dependabot-automerge:
-    timeout-minutes: ${{ fromJSON(vars.GHA_DEFAULT_TIMEOUT) }}
+    timeout-minutes: 10
     runs-on: ubuntu-latest
     if: ${{ github.actor == 'dependabot[bot]' }}
     steps:
@@ -26,4 +26,4 @@ jobs:
       run: gh pr merge --auto --squash "$PR_URL"
       env:
         PR_URL: ${{github.event.pull_request.html_url}}
-        GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+        GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}

.github/workflows/codeql.yaml

@@ -0,0 +1,50 @@
+name: codeql
+
+concurrency:
+  # Run only for most recent commit in PRs but for all tags and commits on main
+  # Ref: https://docs.github.com/en/actions/using-jobs/using-concurrency
+  group: ${{ github.workflow }}-${{ github.head_ref || github.sha }}
+  cancel-in-progress: true
+
+on:
+  push:
+    branches:
+      - 'main'
+  pull_request:
+    branches:
+      - 'main'
+  schedule:
+    - cron: '42 2 * * 4'
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    timeout-minutes: 10
+    name: analyze
+    runs-on: ubuntu-latest
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    strategy:
+      fail-fast: false
+      matrix:
+        language: [ 'go' ]
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+    - name: Install Go
+      uses: actions/setup-go@3041bf56c941b39c61721a86cd11f3bb1338122a # v5.2.0
+      with:
+        go-version-file: go.mod
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@b6a472f63d85b9c78a3ac5e89422239fc15e9b3c # v3.28.1
+      with:
+        languages: ${{ matrix.language }}
+    - name: Autobuild
+      uses: github/codeql-action/autobuild@b6a472f63d85b9c78a3ac5e89422239fc15e9b3c # v3.28.1
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@b6a472f63d85b9c78a3ac5e89422239fc15e9b3c # v3.28.1

.github/workflows/test-pr.yaml

@@ -12,7 +12,7 @@ on:
 
 jobs:
   check-go-mod:
-    timeout-minutes: ${{ fromJSON(vars.GHA_DEFAULT_TIMEOUT) }}
+    timeout-minutes: 10
     name: Check Go modules
     runs-on: ubuntu-latest
     steps:
@@ -32,7 +32,7 @@ jobs:
       run: make verify.diff
 
   lint:
-    timeout-minutes: ${{ fromJSON(vars.GHA_DEFAULT_TIMEOUT) }}
+    timeout-minutes: 10
     name: Lint
     runs-on: ubuntu-latest
     steps:
@@ -50,7 +50,7 @@ jobs:
       run: make lint
 
   unit-test:
-    timeout-minutes: ${{ fromJSON(vars.GHA_DEFAULT_TIMEOUT) }}
+    timeout-minutes: 10
     name: Test
     runs-on: ubuntu-latest
     steps: