Enable workflows only on tag push and on specific directories

.github/workflows/docker-ci.yml

@@ -1,6 +1,11 @@
 name: Docker CI build
 # This workflow is triggered on pushes to the repository.
-on: [push, pull_request]
+on:
+  push:
+    paths-ignore:
+    - 'doc/**'
+    - 'completions/**'
+  pull_request:
 
 jobs:
   build:

.github/workflows/docker-multiarch-tag.yml

@@ -1,5 +1,8 @@
 name: Multiarch build and release
-on: [push] # To change to tag in merge
+on:
+  push:
+    tags:
+      - v**
 
 jobs:
   build-releases: