ci: prevent some useless runs when only docs are updated

.github/workflows/docker.yaml

@@ -4,6 +4,8 @@ on:
   pull_request:
     branches:
       - main
+    paths-ignore:
+      - 'docs/**'
   push:
     branches:
       - main

.github/workflows/static.yaml

@@ -4,6 +4,8 @@ on:
   pull_request:
     branches:
       - main
+    paths-ignore:
+      - 'docs/**'
   push:
     branches:
       - main

.github/workflows/tests.yaml

@@ -4,9 +4,13 @@ on:
   pull_request:
     branches:
       - main
+    paths-ignore:
+      - 'docs/**'
   push:
     branches:
       - main
+    paths-ignore:
+      - 'docs/**'
 jobs:
   tests:
     runs-on: ubuntu-latest