Workaround to fix broken main pipeline

Copies the `/etc/gitaly/config.toml.erb` file as
`/etc/gitaly/config.toml` file as the latest version of gitaly
CNG image no longer writes it but is required by Gitaly to run.

.gitlab-ci.yml

@@ -123,7 +123,7 @@ modules:download:
   services:
     - name: registry.gitlab.com/gitlab-org/build/cng/gitaly:master
       # Disable the hooks so we don't have to stub the GitLab API
-      command: ["bash", "-c", "mkdir -p /home/git/repositories && rm -rf /srv/gitlab-shell/hooks/* && touch /srv/gitlab-shell/.gitlab_shell_secret && exec /usr/bin/env GITALY_TESTING_NO_GIT_HOOKS=1 /scripts/process-wrapper"]
+      command: ["bash", "-c", "mkdir -p /home/git/repositories && rm -rf /srv/gitlab-shell/hooks/* && touch /srv/gitlab-shell/.gitlab_shell_secret && cp /etc/gitaly/config.toml.erb /etc/gitaly/config.toml 2>/dev/null && exec /usr/bin/env GITALY_TESTING_NO_GIT_HOOKS=1 /scripts/process-wrapper"]
       alias: gitaly
 
 tests:

docker-compose.yml

@@ -4,5 +4,7 @@ services:
     environment:
       - GITALY_TESTING_NO_GIT_HOOKS=1
     image: registry.gitlab.com/gitlab-org/build/cng/gitaly:master
+    command:
+      ["bash", "-c", "mkdir -p /home/git/repositories && rm -rf /srv/gitlab-shell/hooks/* && touch /srv/gitlab-shell/.gitlab_shell_secret && cp /etc/gitaly/config.toml.erb /etc/gitaly/config.toml 2>/dev/null && exec /usr/bin/env GITALY_TESTING_NO_GIT_HOOKS=1 /scripts/process-wrapper"]
     ports:
       - '8075:8075'