[CI] Prevented Running the CI If Only the Documentation Is Updated

Added a `path-ignore` filter to the GitHub Actions triggers (including
`push` and `pull_request`) to filter out any push or pull request that
only includes docs updates.

The "Test" and "Containers" workflows will be skipped if a push or a PR
only contains changes to the documentation, such as the developer guide
and README, so that we can save CI resources for other uses.

.github/workflows/containers.yml

@@ -7,7 +7,17 @@ on:
   push:
     branches:
       - master
+    paths-ignore: # Prevents from running if only docs are updated
+      - 'doc/**'
+      - '**/*README*'
+      - '**.md'
+      - '**.rst'
   pull_request:
+    paths-ignore: # Prevents from running if only docs are updated
+      - 'doc/**'
+      - '**/*README*'
+      - '**.md'
+      - '**.rst'
   workflow_dispatch:
   schedule:
   - cron: '0 0 * * 0' # weekly

.github/workflows/test.yml

@@ -7,7 +7,17 @@ on:
   push:
     branches:
       - master
+    paths-ignore: # Prevents from running if only docs are updated
+      - 'doc/**'
+      - '**/*README*'
+      - '**.md'
+      - '**.rst'
   pull_request:
+    paths-ignore: # Prevents from running if only docs are updated
+      - 'doc/**'
+      - '**/*README*'
+      - '**.md'
+      - '**.rst'
   workflow_dispatch:
   schedule:
   - cron: '0 0 * * *' # daily