Try to make cache key more accurate

.github/workflows/ci-main.yml

@@ -263,6 +263,7 @@ jobs:
     env:
       CFG: ${{ matrix.cfg }}
       VCPKG_FEATURE_FLAGS: dependencygraph
+      VCPKG_COMMIT: 417119555f155f6044dec7a379cd25466e339873
     permissions:
       contents: write # for dependency graph
     defaults:
@@ -278,7 +279,8 @@ jobs:
         uses: actions/cache@v3
         with:
           path: vcpkg_installed  # vcpkg generates this dir next to vcpkg.json
-          key: win-cache-master-${{ matrix.cfg }}-0006
+          # the final key part needs to be changed if anything in the build process changes that is not already included here
+          key: win-cache-master-${{ matrix.cfg }}-${{ env.VCPKG_COMMIT }}-${{ hashFiles('vcpkg.json') }}-0001
 
       - name: Add msbuild to PATH
         uses: microsoft/setup-msbuild@v1.1.3
@@ -288,7 +290,7 @@ jobs:
       - name: Build vcpkg
         run: |
           git clone https://github.com/microsoft/vcpkg
-          git -C vcpkg checkout 417119555f155f6044dec7a379cd25466e339873
+          git -C vcpkg checkout %VCPKG_COMMIT%
           vcpkg/bootstrap-vcpkg.bat
 
       - name: Setup cmake