Fix lint job

 - Before the migration to `git-crypt`, `WooCommerce/google-services.json` file did _not_ exist at all as we didn't run `configure_apply`. In which case the gradle task would take care of copying the `google-services.json-example` file in its place
 - Now that we migrated to `git-crypt`, the `WooCommerce/google-services.json` file _always_ exists in the repo, albeit encrypted if the repo was not git-crypt-unlocked after being cloned. So the logic had to be adjusted to copy the `google-services.json-example` file if the `google-services.json` file (which always exists now) is encrypted

Author: AliSoftware

WooCommerce/build.gradle

@@ -496,12 +496,14 @@ android.buildTypes.all { buildType ->
     }
 
     // If Google services file doesn't exist, copy example file.
-    if (!file("google-services.json").exists()) {
+    def googleServicesFile = file("google-services.json")
+    if (!googleServicesFile.exists() || isFileEncrypted(googleServicesFile)) {
+        println("WARNING: Copying google-services.json-example file.")
         tasks.copyGoogleServicesExampleFile.copy()
     }
 
     // Print warning message if example Google services file is used.
-    if ((file("google-services.json").text) == (file("google-services.json-example").text)) {
+    if ((googleServicesFile.text) == (file("google-services.json-example").text)) {
         println("WARNING: You're using the example google-services.json file. Google login will fail.")
     }
 }
@@ -514,6 +516,13 @@ static def loadPropertiesFromFile(inputFile) {
     return properties
 }
 
+static def isFileEncrypted(File file) {
+    def gitcryptHeader = [0x00, 0x47, 0x49, 0x54, 0x43, 0x52, 0x59, 0x50, 0x54] as byte[] // GITCRYPT header
+    def header = new byte[gitcryptHeader.length]
+    file.withInputStream { stream -> stream.read(header) }
+    return Arrays.equals(header, gitcryptHeader)
+}
+
 def isLeakCanaryEnabled() {
     return developerProperties.get("enable_leak_canary") ?: true
 }