Problem: fuzzers not run in PRs

Solution: do it

.github/workflows/Fuzzers.yaml

@@ -1,13 +1,35 @@
 name: Fuzzers
-on: [pull_request]
-
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    paths:
+      - '.github/workflows/Fuzzers.yaml'
+      - 'src/*'
+      - 'tests/*fuzzer.cpp'
 jobs:
   Fuzzing:
     runs-on: ubuntu-latest
+    if: github.repository == 'zeromq/libzmq'
+    strategy:
+      matrix:
+        san: [address, memory, undefined]
     steps:
-    - name: Build Fuzzers
+    - name: Build Fuzzers (${{ matrix.san }})
       id: build
       uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
       with:
+        sanitizer: ${{ matrix.san }}
         oss-fuzz-project-name: 'libzmq'
+        allowed-broken-targets-percentage: 0
         dry-run: false
+    - name: Run Fuzzers (${{ matrix.san }})
+      id: build
+      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+      with:
+        sanitizer: ${{ matrix.san }}
+        oss-fuzz-project-name: 'libzmq'
+        allowed-broken-targets-percentage: 0
+        dry-run: false
+        fuzz-seconds: 300