Updated Windows CI

Author: zfergus

.github/workflows/continuous.yml

@@ -108,30 +108,32 @@ jobs:
         with:
           fetch-depth: 10
       - uses: seanmiddleditch/gha-setup-ninja@master
-        # https://github.com/actions/cache/issues/101
 
       - name: Set env
         run: |
           echo "appdata=$env:LOCALAPPDATA" >> ${env:GITHUB_ENV}
 
       - name: Cache build
         id: cache-build
-        uses: actions/cache@v1
+        uses: actions/cache@v2
         with:
           path: ${{ env.appdata }}\Mozilla\sccache
-          key: ${{ runner.os }}-${{ matrix.config }}-cache
+          key: ${{ runner.os }}-${{ matrix.config }}-cache-${{ github.sha }}
+          restore-keys: ${{ runner.os }}-${{ matrix.config }}-cache
 
       - name: Prepare sccache
         run: |
-          Invoke-Expression (New-Object System.Net.WebClient).DownloadString('https://get.scoop.sh')
+          iwr -useb 'https://raw.githubusercontent.com/scoopinstaller/install/master/install.ps1' -outfile 'install.ps1'
+          .\install.ps1 -RunAsAdmin
           scoop install sccache --global
-          # Scoop modifies the PATH so we make the modified PATH global.
+          # Scoop modifies the PATH so we make it available for the next steps of the job
           echo "${env:PATH}" >> ${env:GITHUB_PATH}
 
       - name: Configure and build
         shell: cmd
         run: |
           call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\Common7\Tools\VsDevCmd.bat" -arch=x64
+          cmake --version
           cmake -G Ninja ^
             -DCMAKE_CXX_COMPILER_LAUNCHER=sccache ^
             -DCMAKE_BUILD_TYPE=${{ matrix.config }} ^