try manual build for core

testdeps build hung at:
```
[...]
Certificate generated: CA=test 300days prime256v1 test-client-cert
Certificate generated: CA=test 300days prime256v1 test-client-eku-only
[427/430] Building C object tests/unit/CMakeFiles/units.dir/units.c.o
[428/430] Linking C executable tests/unit/units
```
https://github.com/curl/curl/actions/runs/17657602508/job/50184080741?pr=18528#step:5:833

.github/workflows/codeql.yml

@@ -114,7 +114,38 @@ jobs:
       - name: 'build'
         run: |
           cmake -B . -G Ninja
-          cmake --build . --target testdeps
+          cmake --build . --verbose --target testdeps
+
+      - name: 'perform analysis'
+        uses: github/codeql-action/analyze@192325c86100d080feab897ff886c34abd4c83a3 # v3
+
+  c-core-manual:
+    name: 'C core manual'
+    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 rm -f /var/lib/man-db/auto-update
+          sudo apt-get -o Dpkg::Use-Pty=0 install libpsl-dev
+
+      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        with:
+          persist-credentials: false
+
+      - name: 'initialize'
+        uses: github/codeql-action/init@192325c86100d080feab897ff886c34abd4c83a3 # v3
+        with:
+          languages: cpp
+          build-mode: manual
+
+      - name: 'build'
+        run: |
+          cmake -B . -G Ninja
+          cmake --build . --verbose
 
       - name: 'perform analysis'
         uses: github/codeql-action/analyze@192325c86100d080feab897ff886c34abd4c83a3 # v3