Introduce branch dependency execution

We want the most important things to fail first and prevent the
other ones from executing

e.g. if your dist/ is not updated, there's no point seeing the tests fail

.github/workflows/hexpm-mirrors.yml

@@ -2,12 +2,10 @@
 name: hexpm-mirrors
 
 on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - main
+  workflow_run:
+    workflows: ["action"]
+    types:
+      - completed
 
 jobs:
   test-failing-first-mirror:

.github/workflows/ubuntu.yml

@@ -2,11 +2,10 @@
 name: ubuntu
 
 on:
-  push:
-    branches:
-      - main
-  pull_request:
-    types: [opened, synchronize]
+  workflow_run:
+    workflows: ["action"]
+    types:
+      - completed
 
 jobs:
   integration_test:

.github/workflows/windows.yml

@@ -2,11 +2,10 @@
 name: windows
 
 on:
-  push:
-    branches:
-      - main
-  pull_request:
-    types: [opened, synchronize]
+  workflow_run:
+    workflows: ["action"]
+    types:
+      - completed
 
 jobs:
   integration_test: