chore: simplify ccache cache logic (#8542)

## **Description**

The mix of the build logic and the fact that every push in the main
triggers a pipeline in bitrise prevents the ccache from caching the main
build files, and subsequent PRs get the benefit of the native
dependencies previously cached in `main`.

This PR simplifies the approach by saving the native modules whenever
something changes so every branch can benefit from the native
dependencies cached.

- [Example pipeline presenting the
issue](https://app.bitrise.io/app/be69d4368ee7e86d/pipelines/ac5b23e0-3481-4906-93b9-f76f58c12014)

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## **Related issues**

Fixes: MetaMask/mobile-planning#1514

## **Manual testing steps**

1. Run smoke and regression pipeline

## **Screenshots/Recordings**

<!-- If applicable, add screenshots and/or recordings to visualize the
before and after of your change. -->

### **Before**

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### **After**

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## **Pre-merge author checklist**

- [x] I’ve followed [MetaMask Coding
Standards](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/CODING_GUIDELINES.md).
- [x] I've clearly explained what problem this PR is solving and how it
is solved.
- [x] I've linked related issues
- [x] I've included manual testing steps
- [x] I've included screenshots/recordings if applicable
- [x] I’ve included tests if applicable
- [x] I’ve documented my code using [JSDoc](https://jsdoc.app/) format
if applicable
- [x] I’ve applied the right labels on the PR (see [labeling
guidelines](https://github.com/MetaMask/metamask-mobile/blob/main/.github/guidelines/LABELING_GUIDELINES.md)).
Not required for external contributors.
- [x] I’ve properly set the pull request status:
  - [x] In case it's not yet "ready for review", I've set it to "draft".
- [x] In case it's "ready for review", I've changed it from "draft" to
"non-draft".

## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
app, test code being changed).
- [ ] I confirm that this PR addresses all acceptance criteria described
in the ticket it closes and includes the necessary testing evidence such
as recordings and or screenshots.

bitrise.yml

@@ -408,6 +408,12 @@ workflows:
     after_run:
       - _notify_failure_on_slack
     steps:
+      - script@1:
+          title: Generating ccache key using native folder checksum
+          inputs:
+            - content: |-
+                #!/usr/bin/env bash
+                ./scripts/cache/set-cache-envs.sh android
       - restore-gradle-cache@2: {}
       - install-missing-android-tools@3:
           inputs:
@@ -420,12 +426,6 @@ workflows:
             - content: |-
                 #!/usr/bin/env bash
                 "${ANDROID_HOME}/tools/bin/sdkmanager" "cmake;3.22.1"
-      - script@1:
-          title: Check native folder diff for Android
-          inputs:
-            - content: |-
-                #!/usr/bin/env bash
-                ./scripts/cache/set-cache-envs.sh android
       - script@1:
           title: Install CCache & symlink
           inputs:
@@ -435,16 +435,22 @@ workflows:
                 sudo apt install ccache
       - restore-cache@2:
           title: Restore CCache
-          run_if: '{{not (enveq "SKIP_CCACHE_RESTORE" "true")}}'
           inputs:
             - key: '{{ getenv "CCACHE_KEY" }}'
+      - script@1:
+          title: Set skip ccache upload
+          run_if: '{{ enveq "BITRISE_CACHE_HIT" "exact" }}'
+          inputs:
+            - content: |-
+                #!/usr/bin/env bash
+                envman add --key SKIP_CCACHE_UPLOAD --value "true"
       - restore-cache@2:
           title: Restore build from cache
           inputs:
             - key: apk-cache-{{ .CommitHash }}
       - script@1:
           title: Run detox build
-          run_if: '{{not (enveq "BITRISE_CACHE_HIT" "exact")}}'
+          run_if: '{{ not (enveq "BITRISE_CACHE_HIT" "exact") }}'
           is_always_run: false
           inputs:
             - content: |-
@@ -571,6 +577,12 @@ workflows:
     after_run:
       - _notify_failure_on_slack
     steps:
+      - script@1:
+          title: Generating ccache key using native folder checksum
+          inputs:
+            - content: |-
+                #!/usr/bin/env bash
+                ./scripts/cache/set-cache-envs.sh ios
       - certificate-and-profile-installer@1: {}
       - set-xcode-build-number@1:
           inputs:
@@ -584,12 +596,6 @@ workflows:
                 envman add --key BREW_OPT_APPLESIMUTILS --value "/usr/local/opt/applesimutils"
                 brew tap wix/brew
           title: Set Env Path for caching deps
-      - script@1:
-          title: Check native folder diff for iOS
-          inputs:
-            - content: |-
-                #!/usr/bin/env bash
-                ./scripts/cache/set-cache-envs.sh ios
       - script@1:
           title: Install CCache & symlink
           inputs:
@@ -604,16 +610,22 @@ workflows:
                 ln -s $(which ccache) /usr/local/bin/clang++
       - restore-cache@2:
           title: Restore CCache
-          run_if: '{{not (enveq "SKIP_CCACHE_RESTORE" "true")}}'
           inputs:
             - key: '{{ getenv "CCACHE_KEY" }}'
+      - script@1:
+          title: Set skip ccache upload
+          run_if: '{{ enveq "BITRISE_CACHE_HIT" "exact" }}'
+          inputs:
+            - content: |-
+                #!/usr/bin/env bash
+                envman add --key SKIP_CCACHE_UPLOAD --value "true"
       - restore-cache@2:
           title: Restore build from cache
           inputs:
             - key: ipa-cache-{{ .CommitHash }}
       - script@1:
           title: Run detox build
-          run_if: '{{not (enveq "BITRISE_CACHE_HIT" "exact")}}'
+          run_if: '{{ not (enveq "BITRISE_CACHE_HIT" "exact") }}'
           is_always_run: false
           inputs:
             - content: |-

scripts/cache/set-cache-envs.sh

@@ -2,34 +2,13 @@
 # Check differences for a given folder and save the checksum as CCACHE_KEY
 set_cache_envs() {
   local folder="$1"
-  local current_branch=$(git rev-parse --abbrev-ref HEAD)
   local prefix_ccache_key="ccache-$folder"
 
-  if [ "$current_branch" = "main" ]; then
-    # If on main branch, skip cache restore but save it for future runs
-    echo "On main branch, we will not use cache, but will save it for future runs"
-    envman add --key SKIP_CCACHE_RESTORE --value true
-  else
-    # Fetch changes from the main branch
-    git fetch origin refs/heads/main
-
-    # Get the differences between the current branch and the main branch for the specified folder
-    local differences=$(git diff origin/main...$current_branch -- $folder)
-
-    # Check if there are no differences
-    if [ -z "$differences" ]; then
-      # If no differences, use the main cache and skip cache upload
-      echo "No differences detected, we will use main cache"
-      envman add --key SKIP_CCACHE_UPLOAD --value true
-      envman add --key CCACHE_KEY --value "$prefix_ccache_key-main"
-      echo "Checksum (CCACHE_KEY) set to $prefix_ccache_key-main"
-    else
-      # Generate a checksum for the differences and set it as CCACHE_KEY
-      local checksum=$(echo "$differences" | sha512sum | awk '{print $1}')
-      envman add --key CCACHE_KEY --value "$prefix_ccache_key-$checksum"
-      echo "Checksum (CCACHE_KEY) set to $prefix_ccache_key-$checksum"
-    fi
-  fi
+  # Generate a checksum for the native dependencies and set it as CCACHE_KEY
+  local checksum=$(find "$folder" -type f -exec sha512sum {} \; | sha512sum | awk '{print $1}')
+  echo "Checksum: $checksum"
+  envman add --key CCACHE_KEY --value "$prefix_ccache_key-$checksum"
+  echo "CCACHE_KEY set to $prefix_ccache_key-$checksum"
 }
 
 # Check if both folder_to_check is provided