[workflow] Only install dotnet when cache is missed

whoops

.github/workflows/build.yml

@@ -23,10 +23,7 @@ on:
           - "net7.0-windows10.0.22000.0"
           - "net7.0-windows10.0.19041.0"
 
-
-
 jobs:
-
   build:
     runs-on: ${{ github.event.inputs.os }}
     strategy:
@@ -39,7 +36,6 @@ jobs:
       Platform: ${{ matrix.platform }}
       DOTNET_INSTALL_DIR: '.\.dotnet' 
 
-
     steps:
     - name: Checkout
       uses: actions/checkout@v3
@@ -49,8 +45,8 @@ jobs:
     - name: Get short Git SHA
       id: vars
       run: | 
-        echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
-        echo "branch=$(echo ${GITHUB_REF#refs/heads/})" >> $GITHUB_OUTPUT
+        echo "sha_short=$(git rev-parse --short HEAD)" >> $GITHUB_ENV
+        echo "branch=$(echo ${GITHUB_REF#refs/heads/})" >> $GITHUB_ENV
 
     - name: Cache dotnet # cache dotnet install https://stackoverflow.com/questions/75180149/how-to-cache-dotnet-installation-in-github-actions
       id: cache-dotnet
@@ -69,6 +65,7 @@ jobs:
           ${{ runner.os }}-nuget-
 
     - name: Install .NET
+      if: ${{ steps.cache-dotnet.outputs.cache-hit != 'true' }}
       uses: actions/setup-dotnet@v3
       with:
         dotnet-version: 7.0.x
@@ -95,5 +92,5 @@ jobs:
       uses: actions/[email protected]
       if: ${{ matrix.configuration == 'Release' }}
       with:
-          name: collapse_${{ steps.vars.outputs.branch }}_${{ steps.vars.outputs.sha_short }}.${{ matrix.platform }}-${{ matrix.configuration }}_${{ github.event.inputs.framework }}
+          name: collapse_${{ env.branch }}_${{ env.sha_short }}.${{ matrix.platform }}-${{ matrix.configuration }}_${{ github.event.inputs.framework }}
           path: ./CollapseLauncher/bin/x64/Release/${{ github.event.inputs.framework }}/