Optimize github action cache (#544)

* optimize github action cache

* fix

* refactor: improve github actions cache optimization (#3)

- move ccache configuration logic to dedicated action
- rename conanfile-changed to should-save-conan-cache for clarity

---------

Co-authored-by: Niq Dudfield <ndudfield@gmail.com>

.github/workflows/xahau-ga-macos.yml

@@ -5,6 +5,8 @@ on:
     branches: ["dev", "candidate", "release"]
   pull_request:
     branches: ["dev", "candidate", "release"]
+  schedule:
+    - cron: '0 0 * * *'
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -74,6 +76,7 @@ jobs:
           max_size: 2G
           hash_dir: true
           compiler_check: content
+          is_main_branch: ${{ github.ref_name == env.MAIN_BRANCH_NAME }}
 
       - name: Check environment
         run: |
@@ -113,4 +116,4 @@ jobs:
 
       - name: Test
         run: |
-          ${{ env.build_dir }}/rippled --unittest --unittest-jobs $(nproc)
+          ${{ env.build_dir }}/rippled --unittest --unittest-jobs $(nproc)