ci: add fuzz job

ci: fuzz: add timeout

ci: fuzz: add fuzzer timeout

ci: fuzz: fix portage venv

.gitea/workflows/gentoo-utils.yml

@@ -125,6 +125,37 @@ jobs:
           meson compile -C build
           ninja test -C build
 
+  fuzz:
+    runs-on: brutalisk
+    env:
+      CC: 'clang'
+      CXX: 'clang++'
+      FUZZER_TIMEOUT_S: 300
+    needs: [build-oci-image, build]
+    container:
+      image: ${{ vars.REGISTRY_URL }}/${{ gitea.repository }}:${{ needs.build-oci-image.outputs.image_tag }}
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v5
+
+      # FIXME: Get rid of this step when portage has fixes merged?
+      # needed because portage has fixes upstream we need that arent stable yet
+      - name: Checkout tip of portage
+        run: |
+          git clone https://github.com/gentoo/portage.git
+          cd portage
+          python -m venv .venv && ./.venv/bin/pip install -e .
+          source ./.venv/bin/activate
+          which emerge
+
+      - name: build and fuzz
+        run: |
+          source ./portage/.venv/bin/activate
+          which emerge
+          meson setup -Dfuzz=enabled -Dtests=enabled -Dbuildtype=debugoptimized build
+          meson compile atom_parser_fuzzer:alias -C build
+          timeout 10m ./scripts/fuzz.sh
+
   check-format:
     runs-on: brutalisk
     needs: [build-oci-image]
@@ -164,5 +195,6 @@ jobs:
         uses: actions/checkout@v5
 
       - name: grep for patterns
+        # negate git grep ret code because 1 means no findings
         run: |
           git grep -E 'todo!|dbg!' -- '*.rs' && exit 1 || exit 0