test/fuzz: check fuzz targets build in ci

NO_DOC=internal
NO_TEST=internal
NO_CHANGELOG=internal

(cherry picked from commit e67faee8)

.gitlab-ci.yml

@@ -72,6 +72,21 @@ coverage:
       - export PATH="$PATH:$PWD" # for GLAuth (CMake will download it)
       - make -f .test.mk test-coverage
 
+# Check that fuzzing works
+fuzz-check-build:
+    extends: .test
+    tags: [shell_p_t]
+    script:
+      # Clone oss-fuzz instead of adding it as a submodule
+      # as we don't want it to be checked by static analyzers - it's used only for fuzzing
+      - git clone https://github.com/google/oss-fuzz.git
+      - cd oss-fuzz
+      # Checkout a fixed oss-fuzz commit to guarantee reproducible builds
+      - git checkout e8e124996508f1e4ffe566896638c7213ab440d5
+      - python3 infra/helper.py build_image --no-pull --external ..
+      - python3 infra/helper.py build_fuzzers --external .. --sanitizer=address
+      - python3 infra/helper.py check_build --external .. --sanitizer=address
+
 .pack:
   tags:
     - shell_p_t