Do not run regress workflows on benign changes

.github/workflows/linux-32bit-build-and-test.yaml

@@ -4,7 +4,15 @@ on:
     branches:
       - main
       - prerelease_test
+    paths-ignore:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
   pull_request:
+    paths-ignore:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
 jobs:
   config:
     runs-on: ubuntu-latest

.github/workflows/linux-build-and-test-ignored.yaml

@@ -0,0 +1,23 @@
+# Ignoring version of the corresponding workflow. These files are
+# needed to run required workflows even when the real workflow is not
+# executed because some files were ignored.
+name: Regression
+on:
+  push:
+    branches:
+      - prerelease_test
+    paths:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
+  pull_request:
+    paths:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
+jobs:
+  regress:
+    runs-on: ubuntu-latest
+    steps:
+      - run: |
+          echo "No build required"

.github/workflows/linux-build-and-test.yaml

@@ -11,7 +11,15 @@ on:
     branches:
       - main
       - prerelease_test
+    paths-ignore:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
   pull_request:
+    paths-ignore:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
 jobs:
   matrixbuilder:
     runs-on: ubuntu-latest

.github/workflows/shellcheck-ignored.yaml

@@ -0,0 +1,22 @@
+# Ignoring version of the corresponding workflow. These files are
+# needed to run required workflows even when the real workflow is not
+# executed because some files were ignored.
+name: Shellcheck
+on:
+  pull_request:
+    paths-ignore:
+      - '**.sh'
+      - .github/workflows/shellcheck.yaml
+  push:
+    branches:
+      - prerelease_test
+    paths-ignore:
+      - '**.sh'
+      - .github/workflows/shellcheck.yaml
+jobs:
+  shellcheck:
+    name: Shellcheck
+    runs-on: ubuntu-latest
+    steps:
+      - run: |
+          echo "No build required"

.github/workflows/shellcheck.yaml

@@ -2,10 +2,16 @@
 name: Shellcheck
 on:
   pull_request:
+    paths:
+      - '**.sh'
+      - .github/workflows/shellcheck.yaml
   push:
     branches:
       - main
       - prerelease_test
+    paths:
+      - '**.sh'
+      - .github/workflows/shellcheck.yaml
 jobs:
   shellcheck:
     name: Shellcheck

.github/workflows/windows-build-and-test.yaml

@@ -5,7 +5,17 @@ on:
     branches:
       - main
       - prerelease_test
+    paths-ignore:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
+      - 'bootstrap*'
   pull_request:
+    paths-ignore:
+      - '**.md'
+      - 'LICENSE*'
+      - NOTICE
+      - 'bootstrap*'
 jobs:
   config:
     runs-on: ubuntu-latest