GHA: re-introduce CodeQL

This mostly reverts commit 173805b2e7.

Add "queries: security-and-quality" which should make a difference
compared to before.

.github/scripts/spellcheck.words

@@ -121,6 +121,8 @@ CMakeLists
 CNA
 CNAME
 CNAMEs
+CodeQL
+codeql
 CODESET
 codeset
 CodeSonar

.github/workflows/codeql.yml

@@ -0,0 +1,85 @@
+# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
+#
+# SPDX-License-Identifier: curl
+
+name: CodeQL
+
+'on':
+  push:
+    branches:
+      - master
+      - '*/ci'
+    paths-ignore:
+      - '**/*.md'
+      - '.circleci/**'
+      - 'appveyor.*'
+      - 'docs/**'
+      - 'packages/**'
+      - 'plan9/**'
+      - 'projects/**'
+      - 'tests/data/**'
+      - 'winbuild/**'
+  pull_request:
+    branches:
+      - master
+    paths-ignore:
+      - '**/*.md'
+      - '.circleci/**'
+      - 'appveyor.*'
+      - 'docs/**'
+      - 'packages/**'
+      - 'plan9/**'
+      - 'projects/**'
+      - 'tests/data/**'
+      - 'winbuild/**'
+  schedule:
+    - cron: '0 0 * * 4'
+
+concurrency:
+  group: ${{ github.workflow }}
+
+permissions: {}
+
+jobs:
+  codeql:
+    runs-on: ubuntu-latest
+    permissions:
+      security-events: write
+    steps:
+      - name: 'install prereqs'
+        run: |
+          sudo rm -f /etc/apt/sources.list.d/microsoft-prod.list
+          sudo apt-get -o Dpkg::Use-Pty=0 update
+          sudo apt-get -o Dpkg::Use-Pty=0 install \
+            libpsl-dev
+
+      - name: Checkout repository
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          persist-credentials: false
+
+      # Initializes the CodeQL tools for scanning.
+      - name: Initialize CodeQL
+        uses: github/codeql-action/init@aa578102511db1f4524ed59b8cc2bae4f6e88195 # v3
+        with:
+          languages: cpp
+          queries: security-and-quality
+
+      # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
+      # If this step fails, then you should remove it and run the build manually (see below)
+      - name: Autobuild
+        uses: github/codeql-action/autobuild@aa578102511db1f4524ed59b8cc2bae4f6e88195 # v3
+
+      # ℹ️ Command-line programs to run using the OS shell.
+      # 📚 https://git.io/JvXDl
+
+      # ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
+      #    and modify them (or add more) to build your code if your project
+      #    uses a compiled language
+
+      # - run: |
+      #    make bootstrap
+      #    make release
+
+      - name: Perform CodeQL Analysis
+        uses: github/codeql-action/analyze@aa578102511db1f4524ed59b8cc2bae4f6e88195 # v3

tests/CI.md

@@ -31,8 +31,10 @@ Consider the following table while looking at pull request failures:
 
  | CI platform as shown in PR          | State  | What to look at next       |
  | ----------------------------------- | ------ | -------------------------- |
+ | CI / codeql                         | stable | quality check results      |
  | CI / fuzzing                        | stable | fuzzing results            |
  | CI / macos ...                      | stable | all errors and failures    |
+ | Code scanning results / CodeQL      | stable | quality check results      |
  | FreeBSD FreeBSD: ...                | stable | all errors and failures    |
  | LGTM analysis: Python               | stable | new findings               |
  | LGTM analysis:  C/C++               | stable | new findings               |
@@ -40,6 +42,7 @@ Consider the following table while looking at pull request failures:
  | AppVeyor                            | flaky  | all errors and failures    |
  | curl.curl (linux ...)               | stable | all errors and failures    |
  | curl.curl (windows ...)             | flaky  | repetitive errors/failures |
+ | CodeQL                              | stable | new findings               |
 
 Sometimes the tests fail due to a dependency service temporarily being offline
 or otherwise unavailable, for example package downloads. In this case you can
@@ -58,7 +61,7 @@ GitHub Actions runs the following tests:
 - macOS tests with a variety of different compilation options
 - Fuzz tests ([see the curl-fuzzer repo for more
   info](https://github.com/curl/curl-fuzzer)).
-- curl compiled using the Rust TLS backend with Hyper
+- CodeQL static analysis
 
 These are each configured in different files in `.github/workflows`.