ci: Split out the fuzz testing

Tacking the fuzz testing onto the PR testing not a good idea. It
causes completely unrelated tests to fail, and doesn't guarantee it
will find newly introduced ones. Running daily is likely better.

Changelog-None No user visible change

.github/workflows/ci.yaml

@@ -179,33 +179,6 @@ jobs:
           tar -xaf cln-${{ matrix.CFG }}.tar.bz2
           make -j $(nproc) check-units installcheck VALGRIND=${{ matrix.VALGRIND }}
 
-  check-fuzz:
-    name: Run fuzz regression tests
-    runs-on: ubuntu-22.04
-    needs:
-      - prebuild
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v4
-        with:
-          python-version: 3.8
-
-      - name: Install dependencies
-        run: |
-          bash -x .github/scripts/setup.sh
-          pip install -U pip wheel poetry
-          # Export and then use pip to install into the current env
-          poetry export -o /tmp/requirements.txt --without-hashes --with dev
-          pip install -r /tmp/requirements.txt
-
-      - name: Build
-        run: |
-          ./configure --enable-debugbuild --enable-fuzzing --enable-address-sanitizer --enable-ub-sanitizer --disable-valgrind CC=clang
-          make -j $(nproc) check-fuzz
-
   integration:
     name: Test CLN ${{ matrix.name }}
     runs-on: ubuntu-22.04

.github/workflows/fuzz.yaml

@@ -0,0 +1,68 @@
+---
+name: Fuzz Testing
+on:
+  schedule:
+    - cron:  '41 3 * * *'
+env:
+  # Makes the upload-artifact work more reliably at the cost
+  # of a bit of compile time.
+  RUST_PROFILE: release
+  SLOW_MACHINE: 1
+jobs:
+  prebuild:
+    name: Pre-build checks
+    runs-on: ubuntu-20.04
+    timeout-minutes: 30
+    env:
+      BOLTDIR: bolts
+    strategy:
+      fail-fast: true
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.8
+
+      - name: Install dependencies
+        run: |
+          bash -x .github/scripts/setup.sh
+          pip install -U pip wheel poetry
+          # Export and then use pip to install into the current env
+          poetry export -o /tmp/requirements.txt --without-hashes --with dev
+          pip install -r /tmp/requirements.txt
+          # We're going to check BOLT quotes, so get the latest version
+          git clone https://github.com/lightning/bolts.git ../${BOLTDIR}
+      - name: Build
+        run: |
+          ./configure --enable-debugbuild --enable-rust
+          make -j 8
+  check-fuzz:
+    name: Run fuzz regression tests
+    runs-on: ubuntu-22.04
+    needs:
+      - prebuild
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up Python 3.8
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.8
+
+      - name: Install dependencies
+        run: |
+          bash -x .github/scripts/setup.sh
+          pip install -U pip wheel poetry
+          # Export and then use pip to install into the current env
+          poetry export -o /tmp/requirements.txt --without-hashes --with dev
+          pip install -r /tmp/requirements.txt
+
+      - name: Build
+        run: |
+          ./configure --enable-debugbuild --enable-fuzzing --enable-address-sanitizer --enable-ub-sanitizer --disable-valgrind CC=clang
+          make -j $(nproc) check-fuzz
+