Run merkledb fuzz tests every 6 hours

.github/workflows/fuzz_merkledb.yml

@@ -0,0 +1,27 @@
+name: Run merkledb fuzz tests
+
+on:
+  workflow_dispatch:
+  schedule:
+    # Run every 6 hours
+    - cron: "0 0,6,12,18 * * *"
+
+permissions:
+  contents: read
+
+jobs:
+  fuzz:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git checkout
+        uses: actions/checkout@v3
+        with:
+          ref: 'dev'
+      - name: Set up Go
+        uses: actions/setup-go@v3
+        with:
+          go-version: '~1.20.10'
+          check-latest: true
+      - name: Run merkledb fuzz tests
+        shell: bash
+        run: ./scripts/build_fuzz.sh 900 ./x/merkledb # Run each merkledb fuzz tests 15 minutes

scripts/build_fuzz.sh

@@ -1,5 +1,11 @@
 #!/usr/bin/env bash
 
+# First argument is the time, in seconds, to run each fuzz test for.
+# If not provided, defaults to 1 second.
+#
+# Second argument is the directory to run fuzz tests in.
+# If not provided, defaults to the current directory.
+
 set -euo pipefail
 
 # Mostly taken from https://github.com/golang/go/issues/46312#issuecomment-1153345129
@@ -10,7 +16,9 @@ AVALANCHE_PATH=$( cd "$( dirname "${BASH_SOURCE[0]}" )"; cd .. && pwd )
 source "$AVALANCHE_PATH"/scripts/constants.sh
 
 fuzzTime=${1:-1}
-files=$(grep -r --include='**_test.go' --files-with-matches 'func Fuzz' .)
+fuzzDir=${2:-.}
+
+files=$(grep -r --include='**_test.go' --files-with-matches 'func Fuzz' $fuzzDir)
 failed=false
 for file in ${files}
 do