Install git and clone the repository when revision is present (#4913)

I've added a command to install git and clone the clusterfuzz repository
if the clusterfuzz revision is passed as a substituition.

This is needed because GCB doesn't pass the content of the respository
as a git project, then we're not able to change the version in the build
time.

The workaround for this is to clone the repository in build time and
then checkout in the given revision.

---------

Signed-off-by: Javan Lacerda <javanlacerda@google.com>

Author: javanlacerda

deploy/cloudbuild.yaml

@@ -32,18 +32,31 @@ steps:
     else
       echo "☑️ _CLUSTERFUZZ_CONFIG_REVISION is not set. Using the latest commit."
     fi
-- name: gcr.io/clusterfuzz-images/base:091c6c2-202409251610
+
+- name: gcr.io/cloud-builders/git
   entrypoint: bash
   args:
   - -c
   - |
-    # Conditionally run 'git checkout' if the revision is provided
+    # Conditionally clone the upstream clusterfuzz and 'git checkout' if the revision is provided
     if [ -n "${_CLUSTERFUZZ_REVISION}" ]; then
       echo "✅ _CLUSTERFUZZ_REVISION is set. Checking out to commit: ${_CLUSTERFUZZ_REVISION}"
+      git clone https://github.com/google/clusterfuzz.git
+      cd clusterfuzz
       git checkout "${_CLUSTERFUZZ_REVISION}"
     else
       echo "☑️ _CLUSTERFUZZ_REVISION is not set. Using the latest commit."
     fi
+
+- name: gcr.io/clusterfuzz-images/base:091c6c2-202409251610
+  entrypoint: bash
+  args:
+  - -c
+  - |
+    # Conditionally run go into the cloned clusterfuzz
+    if [ -n "${_CLUSTERFUZZ_REVISION}" ]; then
+      cd clusterfuzz
+    fi
     
     # Install required deps for performing butler deploy
     bash ./local/install_deps.bash