ci: ignore github markdown templates in all workflows

Ensure that the following paths are ignored everywhere:

- '.github/ISSUE_TEMPLATE/*'
- .github/pull_request_template.md

To avoid running CI unnecessarily.

Currently, they're only ignored on .github/workflows/build-extra.yml.

.github/workflows/build.yml

@@ -4,7 +4,9 @@ on:
   push:
     branches: [ master ]
     paths-ignore:
+      - '.github/ISSUE_TEMPLATE/*'
       - .git-blame-ignore-revs
+      - .github/pull_request_template.md
       - .gitignore
       - CONTRIBUTING.md
       - COPYING
@@ -15,7 +17,9 @@ on:
   pull_request:
     branches: [ master ]
     paths-ignore:
+      - '.github/ISSUE_TEMPLATE/*'
       - .git-blame-ignore-revs
+      - .github/pull_request_template.md
       - .gitignore
       - CONTRIBUTING.md
       - COPYING

.github/workflows/codeql-analysis.yml

@@ -9,8 +9,10 @@ on:
   push:
     branches: [ master ]
     paths-ignore:
+      - '.github/ISSUE_TEMPLATE/*'
       - 'etc/**'
       - .git-blame-ignore-revs
+      - .github/pull_request_template.md
       - .gitignore
       - CONTRIBUTING.md
       - COPYING
@@ -22,8 +24,10 @@ on:
     # The branches below must be a subset of the branches above
     branches: [ master ]
     paths-ignore:
+      - '.github/ISSUE_TEMPLATE/*'
       - 'etc/**'
       - .git-blame-ignore-revs
+      - .github/pull_request_template.md
       - .gitignore
       - CONTRIBUTING.md
       - COPYING