workflows: enable CodeQL checks

CodeQL is a tool to do static analysis for Go code. Since it's
easily available to Github workflows, start using it as part of
lint checks.

Signed-off-by: Mikko Ylinen <[email protected]>

.github/workflows/lib-codeql.yaml

@@ -0,0 +1,35 @@
+name: "CodeQL"
+
+on:
+  workflow_call:
+
+permissions:
+  actions: read
+  contents: read
+
+jobs:
+  analyze:
+    name: Analysis
+    runs-on: ubuntu-24.04
+    timeout-minutes: 360
+
+    permissions:
+      security-events: write
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+    - uses: actions/setup-go@v5
+      with:
+        go-version-file: ./src/cloud-api-adaptor/go.mod
+        check-latest: true
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: 'go'
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:go"

.github/workflows/lint.yaml

@@ -77,6 +77,15 @@ jobs:
       - name: check
         run: make golangci-lint
 
+  codeql:
+    permissions:
+      actions: read
+      contents: read
+      security-events: write
+    needs:
+      - vet-and-fmt
+    uses: "./.github/workflows/lib-codeql.yaml"
+
   shellcheck:
     name: shellcheck
     runs-on: ubuntu-24.04