Update GH Action to use AZ Blob. (#79)

.github/workflows/build.yml

@@ -9,7 +9,7 @@ on:
     types: [opened, synchronize, reopened]
 
 env:
-  VCPKG_BINARY_SOURCES: clear;files,${{ github.workspace }}/vcpkg_cache,readwrite
+  VCPKG_BINARY_SOURCES: clear;x-azblob,${{ vars.AZ_BLOB_VCPKG_URL }},${{ secrets.AZ_BLOB_SAS }},readwrite
 
 jobs:
   build:
@@ -29,22 +29,9 @@ jobs:
       # checkout USVFS and vcpkg
       - uses: actions/checkout@v4
 
-      - name: Restore vcpkg cache
-        uses: actions/cache/restore@v4
-        with:
-          path: ${{ github.workspace }}/vcpkg_cache
-          key: vcpkg-${{ matrix.arch }}-${{ matrix.config }}-${{ hashFiles('vcpkg.json') }}
-          restore-keys: vcpkg-${{ matrix.arch }}-${{ matrix.config }}
-
       # configure
       - run: cmake --preset vs2022-windows-${{ matrix.arch }} -B build_${{ matrix.arch }} "-DCMAKE_INSTALL_PREFIX=install/${{ matrix.config }}"
 
-      - name: Save vcpkg cache
-        uses: actions/cache/save@v4
-        with:
-          path: ${{ github.workspace }}/vcpkg_cache
-          key: vcpkg-${{ matrix.arch }}-${{ matrix.config }}-${{ hashFiles('vcpkg.json') }}
-
       # build
       - run: cmake --build build_${{ matrix.arch }} --config ${{ matrix.config }} --target INSTALL