add qualifiers to cache key. move cahe directory out of build directory.

Author: scareything

.github/workflows/CI.yml

@@ -43,15 +43,24 @@ jobs:
       with:
         vcpkgJsonGlob: './deps/ziti-tunnel-sdk-c/vcpkg.json'
 
+    - name: get vcpkg cache key
+      id: get_vcpkg_cache_key
+      shell: bash
+      env:
+        KEY_PREFIX: vcpkg_cache-${{ matrix.spec.toolchain }}
+      run: |
+        common_key="${KEY_PREFIX}-vcpkg_json_md5=$(md5sum ./deps/ziti-tunnel-sdk-c/vcpkg.json | awk '{ print $1 }')"
+        echo "key=${common_key}-ImageVersion=${ImageVersion}" | tee -a $GITHUB_OUTPUT      
+
     - uses: actions/cache@v5
       with:
-        key: vcpkg_cache_${{ matrix.spec.name }}
-        path: ./deps/ziti-tunnel-sdk-c/${{ matrix.spec.name }}/vcpkg_cache
+        key: ${{ steps.get_vcpkg_cache_key.outputs.key }}
+        path: ./deps/ziti-tunnel-sdk-c/${{ matrix.spec.toolchain }}/vcpkg_cache
 
     - name: ${{ matrix.spec.name }}
       env:
         TOOLCHAIN: ${{ matrix.spec.toolchain && format('../../toolchains/{0}.cmake', matrix.spec.toolchain) || '' }}
-        VCPKG_BINARY_SOURCES: "clear;files,/Users/runner/work/ziti-sdk-swift/ziti-sdk-swift/deps/ziti-tunnel-sdk-c/${{ matrix.spec.name }}/vcpkg_cache,readwrite"
+        VCPKG_BINARY_SOURCES: "clear;files,/Users/runner/work/ziti-sdk-swift/ziti-sdk-swift/deps/ziti-tunnel-sdk-c/${{ matrix.spec.toolchain }}/vcpkg_cache,readwrite"
       run: |
         (cd deps/ziti-tunnel-sdk-c && git fetch --tags)
         cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo -DTLSUV_TLSLIB=openssl -DEXCLUDE_PROGRAMS=ON -DVCPKG_INSTALL_OPTIONS="--overlay-ports=./deps/vcpkg-overlays/json-c" -DZITI_TUNNEL_BUILD_TESTS=OFF -DCMAKE_TOOLCHAIN_FILE="${TOOLCHAIN}" -S ./deps/ziti-tunnel-sdk-c -B ./deps/ziti-tunnel-sdk-c/${{ matrix.spec.name }}