update(workflow): use forgejo cache

.github/workflows/custom-android-build.yml

@@ -18,7 +18,7 @@ env:
   FLUTTER_VERSION: "3.24.5"
   ANDROID_FLUTTER_VERSION: "3.24.5"
   TAG_NAME: "${{ inputs.upload-tag }}"
-  VCPKG_BINARY_SOURCES: "clear;x-gha,readwrite"
+  VCPKG_BINARY_SOURCES: "clear;files,/opt/vcpkg-cache,readwrite"
   VCPKG_COMMIT_ID: "120deac3062162151622ca4860575a33844ba10b"
   VERSION: "1.4.6"
   NDK_VERSION: "r27c"
@@ -61,13 +61,6 @@ jobs:
           docker-images: true
           swap-storage: false
 
-      - name: Export GitHub Actions cache environment variables
-        uses: https://github.com/actions/github-script@v6
-        with:
-          script: |
-            core.exportVariable('ACTIONS_CACHE_URL', process.env.ACTIONS_CACHE_URL || '');
-            core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env.ACTIONS_RUNTIME_TOKEN || '');
-
       - name: Install dependencies
         run: |
           sudo apt-get update
@@ -113,6 +106,7 @@ jobs:
         with:
           channel: "stable"
           flutter-version: ${{ env.ANDROID_FLUTTER_VERSION }}
+          cache: true
 
       - name: Patch flutter
         run: |
@@ -125,12 +119,20 @@ jobs:
           ndk-version: ${{ env.NDK_VERSION }}
           add-to-path: true
 
-      - name: Setup vcpkg with Github Actions binary cache
+      # vcpkg 빌드 바이너리 캐시 — 첫 실행 이후 수시간 절약
+      # 캐시 키: VCPKG_COMMIT_ID + target arch 조합 → arch별 독립 캐시
+      - name: Cache vcpkg binary cache
+        uses: actions/cache@v3
+        with:
+          path: /opt/vcpkg-cache
+          key: vcpkg-android-${{ matrix.job.target }}-${{ env.VCPKG_COMMIT_ID }}
+
+      - name: Setup vcpkg
         uses: https://github.com/lukka/run-vcpkg@v11
         with:
           vcpkgDirectory: /opt/artifacts/vcpkg
           vcpkgGitCommitId: ${{ env.VCPKG_COMMIT_ID }}
-          doNotCache: false
+          doNotCache: true  # run-vcpkg 자체 캐시 비활성화 (위의 actions/cache로 대체)
 
       - name: Install vcpkg dependencies
         shell: bash
@@ -138,6 +140,7 @@ jobs:
           ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
           ANDROID_NDK_ROOT: ${{ steps.setup-ndk.outputs.ndk-path }}
         run: |
+          mkdir -p /opt/vcpkg-cache
           case ${{ matrix.job.target }} in
             aarch64-linux-android)   ANDROID_TARGET=arm64-v8a   ;;
             armv7-linux-androideabi) ANDROID_TARGET=armeabi-v7a ;;
@@ -168,13 +171,21 @@ jobs:
           prefix-key: rustdesk-lib-cache-android
           key: ${{ matrix.job.target }}
 
+      # cargo-ndk 바이너리 캐시 — 버전 고정이므로 거의 항상 hit
+      - name: Cache cargo-ndk binary
+        uses: actions/cache@v3
+        with:
+          path: ~/.cargo/bin/cargo-ndk
+          key: cargo-ndk-${{ env.CARGO_NDK_VERSION }}-${{ runner.os }}
+
       - name: Build rustdesk lib
         env:
           ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
           ANDROID_NDK_ROOT: ${{ steps.setup-ndk.outputs.ndk-path }}
         run: |
           rustup target add ${{ matrix.job.target }}
-          cargo install cargo-ndk --version ${{ env.CARGO_NDK_VERSION }} --locked
+          # 캐시 hit 시 재설치 생략
+          command -v cargo-ndk &>/dev/null || cargo install cargo-ndk --version ${{ env.CARGO_NDK_VERSION }} --locked
           case ${{ matrix.job.target }} in
             aarch64-linux-android)
               ./flutter/ndk_arm64.sh
@@ -297,13 +308,6 @@ jobs:
           docker-images: true
           swap-storage: false
 
-      - name: Export GitHub Actions cache environment variables
-        uses: https://github.com/actions/github-script@v6
-        with:
-          script: |
-            core.exportVariable('ACTIONS_CACHE_URL', process.env.ACTIONS_CACHE_URL || '');
-            core.exportVariable('ACTIONS_RUNTIME_TOKEN', process.env.ACTIONS_RUNTIME_TOKEN || '');
-
       - name: Install dependencies
         run: |
           sudo apt-get update
@@ -327,6 +331,7 @@ jobs:
         with:
           channel: "stable"
           flutter-version: ${{ env.ANDROID_FLUTTER_VERSION }}
+          cache: true
 
       - name: Patch flutter
         run: |