chore(ci) retry build 3 times before failing (#1166)

Author: richardmcclellan

.github/workflows/gradle.yml

@@ -23,4 +23,4 @@ jobs:
     - name: Grant execute permission for gradlew
       run: chmod +x gradlew
     - name: Build with Gradle
-      run: ./gradlew build
+      run: scripts/retry.sh 3 "./gradlew clean build"

scripts/retry.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+# Usage: retry.sh <max_tries> <command to run>
+
+readonly max_tries=$1
+readonly command="${@: 2}"
+attempts=0
+return_code=1
+while [[ $attempts -lt $max_tries ]]; do
+  ((attempts++))
+  if [[ attempts -gt 1 ]]; then sleep 10; fi
+  echo "RETRY: Attempt $attempts of $max_tries."
+  $command && break
+done
+
+return_code=$?
+
+if [[ $return_code == 0 ]]; then
+  echo "RETRY: Attempt $attempts succeeded."
+else
+  echo "RETRY: All $attempts attempts failed."
+fi
+
+exit $return_code