use the ubuntu slim image

apps/cic-notify/cic_notify/version.py

@@ -10,7 +10,7 @@ from cic_notify.error import PleaseCommitFirstError
 
 logg = logging.getLogger()
 
-version = (0, 4, 0, 'alpha.2')
+version = (0, 4, 0, 'alpha.3')
 
 version_object = semver.VersionInfo(
         major=version[0],
@@ -24,9 +24,6 @@ version_string = str(version_object)
 
 def git_hash():
     import subprocess
-    git_diff = subprocess.run(['git', 'diff'], capture_output=True)
-    if len(git_diff.stdout) > 0:
-        raise PleaseCommitFirstError()
 
     git_hash = subprocess.run(['git', 'rev-parse', 'HEAD'], capture_output=True)
     git_hash_brief = git_hash.stdout.decode('utf-8')[:8]
@@ -35,7 +32,7 @@ def git_hash():
 
 try:
     version_git = git_hash()
-    version_string += '.build.{}'.format(version_git)
+    version_string += '+build.{}'.format(version_git)
 except FileNotFoundError:
     time_string_pair = str(time.time()).split('.')
     version_string += '+build.{}{:<09d}'.format(