Fix cache root directory (#87)

* Use `gradlew` path as project's root path

* Add basic check to tests

bitrise.yml

@@ -205,6 +205,14 @@ workflows:
             echo "[output] BITRISE_MAPPING_PATH: ${BITRISE_MAPPING_PATH}"
             echo "[output] BITRISE_CACHE_INCLUDE_PATHS: ${BITRISE_CACHE_INCLUDE_PATHS}"
             echo "[output] BITRISE_CACHE_EXCLUDE_PATHS: ${BITRISE_CACHE_EXCLUDE_PATHS}"
+            if [ -z "${BITRISE_CACHE_INCLUDE_PATHS}" ]; then
+              echo "Include paths are not set"
+              exit 1
+            fi
+            if [ -z "${BITRISE_CACHE_EXCLUDE_PATHS}" ]; then
+              echo "Exclude paths are not set"
+              exit 1
+            fi
             set -x
             ls -alh "$BITRISE_DEPLOY_DIR"
 

main.go

@@ -277,8 +277,7 @@ func main() {
 
 	// Collecting caches
 	log.Infof("Collecting cache:")
-	const defaultProjectRoot = "."
-	if warning := cache.Collect(defaultProjectRoot, utilscache.Level(configs.CacheLevel)); warning != nil {
+	if warning := cache.Collect(filepath.Dir(gradlewPath), utilscache.Level(configs.CacheLevel)); warning != nil {
 		log.Warnf("%s", warning)
 	}