Cache Git LFS objects in CI to reduce bandwidth usage (#6315)

Add actions/cache for .git/lfs in all workflows that fetch LFS objects
(unity_build, mac_build, ios_testflight, ios_addressables_build).
The cache key is based on .gitattributes so it updates when LFS tracking
rules change. Subsequent runs restore from cache and git lfs pull only
fetches new/changed objects, avoiding re-downloading the full 6+ GB.

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

.github/workflows/ios_addressables_build.yml

@@ -57,10 +57,22 @@ jobs:
           git clean -ffd
           rm -rf src/main/csharp/net/eagle0/clients/unity/eagle0/Library/Bee/
 
+      - name: Cache LFS objects
+        uses: actions/cache@v4
+        with:
+          path: .git/lfs
+          key: lfs-${{ runner.os }}-${{ hashFiles('.gitattributes') }}
+          restore-keys: |
+            lfs-${{ runner.os }}-
+
       - name: Fetch LFS files
         run: |
           git lfs install
+          echo "LFS objects before pull:"
+          git lfs ls-files | wc -l
           git lfs pull
+          echo "LFS objects after pull:"
+          git lfs ls-files | wc -l
 
       - name: Ensure Unity version installed
         run: ./ci/github_actions/ensure_unity_installed.sh ios

.github/workflows/ios_testflight.yml

@@ -45,10 +45,22 @@ jobs:
           git clean -ffd
           rm -rf src/main/csharp/net/eagle0/clients/unity/eagle0/Library/Bee/
 
+      - name: Cache LFS objects
+        uses: actions/cache@v4
+        with:
+          path: .git/lfs
+          key: lfs-${{ runner.os }}-${{ hashFiles('.gitattributes') }}
+          restore-keys: |
+            lfs-${{ runner.os }}-
+
       - name: Fetch LFS files
         run: |
           git lfs install
+          echo "LFS objects before pull:"
+          git lfs ls-files | wc -l
           git lfs pull
+          echo "LFS objects after pull:"
+          git lfs ls-files | wc -l
 
       - name: Ensure Unity version installed
         run: ./ci/github_actions/ensure_unity_installed.sh ios

.github/workflows/mac_build.yml

@@ -108,10 +108,22 @@ jobs:
             rm -rf "$BEE_DIR"
           fi
 
+      - name: Cache LFS objects
+        uses: actions/cache@v4
+        with:
+          path: .git/lfs
+          key: lfs-${{ runner.os }}-${{ hashFiles('.gitattributes') }}
+          restore-keys: |
+            lfs-${{ runner.os }}-
+
       - name: Fetch LFS files
         run: |
           git lfs install
+          echo "LFS objects before pull:"
+          git lfs ls-files | wc -l
           git lfs pull
+          echo "LFS objects after pull:"
+          git lfs ls-files | wc -l
 
       - name: Ensure Unity version installed
         run: ./ci/github_actions/ensure_unity_installed.sh mac

.github/workflows/unity_build.yml

@@ -95,10 +95,22 @@ jobs:
             rm -rf "$BEE_DIR"
           fi
 
+      - name: Cache LFS objects
+        uses: actions/cache@v4
+        with:
+          path: .git/lfs
+          key: lfs-${{ runner.os }}-${{ hashFiles('.gitattributes') }}
+          restore-keys: |
+            lfs-${{ runner.os }}-
+
       - name: Fetch LFS files
         run: |
           git lfs install
+          echo "LFS objects before pull:"
+          git lfs ls-files | wc -l
           git lfs pull
+          echo "LFS objects after pull:"
+          git lfs ls-files | wc -l
       - name: Sync Bazel Xcode config
         run: ./scripts/sync_bazel_xcode.sh
       - name: Ensure Unity version installed