Replace GitHub cache action with local runner cache

.gitea/workflows/build.yml

@@ -47,19 +47,30 @@ jobs:
           fetch-tags: true
           submodules: false
 
-      - name: Prepare submodule cache key
+      - name: Prepare cache keys
         run: |
           git submodule status --cached --recursive > .ci-submodules.lock
+          DEPENDS_KEY="$(cat contrib/depends/Makefile contrib/depends/funcs.mk contrib/depends/hosts/*.mk contrib/depends/packages/*.mk contrib/depends/toolchain.cmake.in | sha256sum | cut -d' ' -f1)"
+          echo "EXTERNAL_CACHE_KEY=$(sha256sum .ci-submodules.lock | cut -d' ' -f1)" >> "$GITHUB_ENV"
+          echo "DEPENDS_CACHE_KEY=${DEPENDS_KEY}" >> "$GITHUB_ENV"
 
       - name: Restore external cache
-        id: cache-external
-        uses: https://github.com/actions/cache@v3
-        with:
-          path: external
-          key: external-${{ hashFiles('.ci-submodules.lock') }}
+        run: |
+          CACHE_ROOT="${RUNNER_TOOL_CACHE:-/tmp}/peya-ci"
+          EXTERNAL_ARCHIVE="${CACHE_ROOT}/external-${EXTERNAL_CACHE_KEY}.tar.zst"
+          if [ -f "${EXTERNAL_ARCHIVE}" ]; then
+            echo "Restoring external cache from ${EXTERNAL_ARCHIVE}"
+            rm -rf external
+            mkdir -p external
+            tar --zstd -xf "${EXTERNAL_ARCHIVE}"
+            echo "EXTERNAL_CACHE_HIT=true" >> "$GITHUB_ENV"
+          else
+            echo "No external cache found"
+            echo "EXTERNAL_CACHE_HIT=false" >> "$GITHUB_ENV"
+          fi
 
       - name: Sync submodules
-        if: steps.cache-external.outputs.cache-hit != 'true'
+        if: env.EXTERNAL_CACHE_HIT != 'true'
         run: |
           git submodule sync --recursive
           git submodule update --init --recursive --depth 1
@@ -84,15 +95,17 @@ jobs:
             ${{ matrix.toolchain.packages }}
 
       - name: Restore depends cache
-        id: cache-depends
-        uses: https://github.com/actions/cache@v3
-        with:
-          path: |
-            contrib/depends/built
-            contrib/depends/sources
-            contrib/depends/work/build
-            contrib/depends/${{ matrix.toolchain.host }}
-          key: depends-${{ matrix.toolchain.host }}-${{ hashFiles('contrib/depends/Makefile', 'contrib/depends/funcs.mk', 'contrib/depends/hosts/*.mk', 'contrib/depends/packages/*.mk', 'contrib/depends/toolchain.cmake.in') }}
+        run: |
+          CACHE_ROOT="${RUNNER_TOOL_CACHE:-/tmp}/peya-ci"
+          DEPENDS_ARCHIVE="${CACHE_ROOT}/depends-${{ matrix.toolchain.host }}-${DEPENDS_CACHE_KEY}.tar.zst"
+          if [ -f "${DEPENDS_ARCHIVE}" ]; then
+            echo "Restoring depends cache from ${DEPENDS_ARCHIVE}"
+            tar --zstd -xf "${DEPENDS_ARCHIVE}"
+            echo "DEPENDS_CACHE_HIT=true" >> "$GITHUB_ENV"
+          else
+            echo "No depends cache found"
+            echo "DEPENDS_CACHE_HIT=false" >> "$GITHUB_ENV"
+          fi
 
       - name: Prepare MinGW alternatives
         if: ${{ matrix.toolchain.host == 'x86_64-w64-mingw32' || matrix.toolchain.host == 'i686-w64-mingw32' }}
@@ -104,6 +117,30 @@ jobs:
         run: |
           make depends target=${{ matrix.toolchain.host }} -j"$(nproc)"
 
+      - name: Save external cache
+        if: success()
+        run: |
+          CACHE_ROOT="${RUNNER_TOOL_CACHE:-/tmp}/peya-ci"
+          EXTERNAL_ARCHIVE="${CACHE_ROOT}/external-${EXTERNAL_CACHE_KEY}.tar.zst"
+          mkdir -p "${CACHE_ROOT}"
+          if [ ! -f "${EXTERNAL_ARCHIVE}" ]; then
+            tar --zstd -cf "${EXTERNAL_ARCHIVE}" external
+          fi
+
+      - name: Save depends cache
+        if: success()
+        run: |
+          CACHE_ROOT="${RUNNER_TOOL_CACHE:-/tmp}/peya-ci"
+          DEPENDS_ARCHIVE="${CACHE_ROOT}/depends-${{ matrix.toolchain.host }}-${DEPENDS_CACHE_KEY}.tar.zst"
+          mkdir -p "${CACHE_ROOT}"
+          if [ ! -f "${DEPENDS_ARCHIVE}" ]; then
+            tar --zstd -cf "${DEPENDS_ARCHIVE}" \
+              contrib/depends/built \
+              contrib/depends/sources \
+              contrib/depends/work/build \
+              contrib/depends/${{ matrix.toolchain.host }}
+          fi
+
       - name: Package release archive
         if: ${{ matrix.toolchain.package_artifact }}
         run: |