Fixed a task processing bug

acm.py

@@ -28,7 +28,11 @@ VERSION = "1.4.0"
 
 
 async def run_command_shell(
-        command, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.PIPE, on_success: List[Callable] = [()]):
+    command,
+    stdout=asyncio.subprocess.PIPE,
+    stderr=asyncio.subprocess.PIPE,
+    on_success: List[Callable] = [()]
+):
     """Run command in subprocess (shell).
 
     Note:
@@ -43,6 +47,7 @@ async def run_command_shell(
 
     if process.returncode == 0:
         for callable in on_success:
+            if callable is not None:
                 callable()
 
     if stdout != asyncio.subprocess.DEVNULL:

pipeline.yml

@@ -1,11 +1,10 @@
----
 resources:
   - name: git-resource
     type: git
     icon: git
     source:
       uri: https://git.nulloctet.com/warricksothr/Asset-Compression-Manager.git
-      tag_filter: "*[0-9].*[0-9].*[0-9]"
+      tag_filter: '*[0-9].*[0-9].*[0-9]'
   - name: git-resource-image-nexus
     type: docker-image
     icon: docker
@@ -20,21 +19,25 @@ resources:
       repository: sothr/acm
       username: ((hub_docker_write.username))
       password: ((hub_docker_write.password))
-
 jobs:
   - name: build-image
     plan:
       - get: git-resource
         trigger: true
+      - in_parallel:
           - put: git-resource-image-nexus
             params:
               build: git-resource
+              cache: sothr/acm:latest
               tag_file: git-resource/.git/ref
               tag_as_latest: true
-      get_params: {skip_download: true}
+            get_params:
+              skip_download: true
           - put: git-resource-image
             params:
               build: git-resource
+              cache: sothr/acm:latest
               tag_file: git-resource/.git/ref
               tag_as_latest: true
-      get_params: {skip_download: true}
+            get_params:
+              skip_download: true