BF: Syntax. Basic manifest ci rules validation

.ci/check_manifest_gitlab_ci_yml.py

+#!/usr/bin/env python
+import yaml
+with open('manifest-gitlab-ci.yml', 'rt') as f:
+    print(yaml.load(f.read(), Loader=yaml.Loader))

.gitlab-ci.yml

@@ -33,6 +33,17 @@ test:
     - python -c 'import manifest_rules; print(manifest_rules.__version__)'
 
 
+check-manifest-gitab-ci-yml:
+  stage: test
+  image: python:3.9
+  tags:
+    - fsl-ci
+    - docker
+  script:
+    - pip install git+https://git.fmrib.ox.ac.uk/fsl/fsl-ci-rules.git
+    - python ./.ci/check_manifest_gitlab_ci_yml.py
+
+
 check-version:
   stage: check-version
   image: python:3.9

manifest_rules/test_manifest.py

@@ -29,7 +29,7 @@ def main():
 
     # patch the manifest to refer to local environment files
     for build in manifest['versions'][version]:
-        envfname = build['environment']).split('//')[-1]
+        envfname = build['environment'].split('//')[-1]
         build['environment'] = op.join(environment_dir, envfname)
 
     with open(manifest_file, 'wt') as f: