ci: add path filters to skip workflows on documentation-only changes

- Add paths-ignore for *.md files to spell-check, clang-format, and codecov workflows
- Reduces unnecessary CI runs when only documentation is modified
- Addresses issue valkey-io#626

Signed-off-by: Hanxi Zhang <hanxizh@amazon.com>

Author: hanxizh9910

.github/workflows/clang-format.yml

@@ -2,9 +2,13 @@ name: Clang Format Check
 
 on:
   push:
+    paths-ignore:
+      - '**/*.md'
   pull_request:
     paths:
       - 'src/**'
+    paths-ignore:
+      - '**/*.md'
 
 concurrency:
   group: clang-${{ github.head_ref || github.ref }}

.github/workflows/codecov.yml

@@ -2,7 +2,13 @@ name: "Codecov"
 
 # Enabling on each push is to display the coverage changes in every PR, 
 # where each PR needs to be compared against the coverage of the head commit
-on: [push, pull_request]
+on:
+  push:
+    paths-ignore:
+      - '**/*.md'
+  pull_request:
+    paths-ignore:
+      - '**/*.md'
 
 concurrency:
   group: codecov-${{ github.head_ref || github.ref }}

.github/workflows/spell-check.yml

@@ -7,7 +7,11 @@ name: Spellcheck
 
 on:
   push:
+    paths-ignore:
+      - '**/*.md'
   pull_request:
+    paths-ignore:
+      - '**/*.md'
 
 concurrency:
   group: spellcheck-${{ github.head_ref || github.ref }}