Manifest build: add support for SSH_CONFIG variable

build-common.yml

@@ -42,6 +42,8 @@ workflow:
   # and have been stored in the GITLAB_KNOWN_HOSTS CI/CD variable.
   - echo "$GITLAB_KNOWN_HOSTS" >> ~/.ssh/known_hosts
   - chmod 644 ~/.ssh/known_hosts
+  # Write SSH configuration from variable to config file
+  - echo "$SSH_CONFIG" > ~/.ssh/config
 
 .repo_checkout:
   - echo "${LOGPREFIX} Perform repo checkout"