Add codeql workflow (#1685)

Signed-off-by: dkwon17 <dakwon@redhat.com>

Author: dkwon17

.github/workflows/codeql.yml

@@ -0,0 +1,81 @@
+#
+# Copyright (c) 2019-2026 Red Hat, Inc.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: DevWorkspace Operator CodeQL scan
+
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/codeql.yml'
+  pull_request:
+    branches: [ main ]
+    paths:
+      - '**.go'
+      - 'go.mod'
+      - 'go.sum'
+      - '.github/workflows/codeql.yml'
+  schedule:
+    - cron: '15 7 * * 1'
+
+permissions:
+  contents: read
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      security-events: write
+      packages: read
+
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - language: go
+          build-mode: manual
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
+      with:
+        persist-credentials: false
+    - name: Set up Go 1.x
+      uses: actions/setup-go@40f1582b2485089dde7abd97c1529aa768e1baff # v5.6.0
+      with:
+        go-version-file: go.mod
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@e4fba868fa4b1b91e1fdab776edc8cfbe6e9fb81 # v4.37.3
+      with:
+        languages: ${{ matrix.language }}
+        build-mode: ${{ matrix.build-mode }}
+
+    - name: Run manual build steps
+      if: matrix.build-mode == 'manual'
+      shell: bash
+      run: |
+        make manager
+        make compile-devworkspace-controller
+        make compile-webhook-server
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@e4fba868fa4b1b91e1fdab776edc8cfbe6e9fb81 # v4.37.3
+      with:
+        category: "/language:${{matrix.language}}"