When redirecting envvars/%path%, use bash

The default (powershell) for Windows doesn't seem to be working for adding envvar/path

.github/workflows/build.yml

@@ -12,7 +12,8 @@ jobs:
       - name: 🤘 checkout
         uses: actions/checkout@v2
       - name: 🖉 version
-        run: echo "VERSION_SUFFIX=$(git name-rev --name-only --refs=refs/heads/* HEAD).$($env:GITHUB_RUN_NUMBER)" >> $GITHUB_ENV
+        run: echo "VERSION_SUFFIX=$(git name-rev --name-only --refs=refs/heads/* HEAD).$GITHUB_RUN_NUMBER" >> $GITHUB_ENV
+        shell: bash
       - name: ⚙ dotnet 5.0.x
         uses: actions/setup-dotnet@v1
         with:
@@ -29,11 +30,13 @@ jobs:
         run: dotnet tool update -g dotnet-vs
       - name: 🔍 vs 16.8+
         run: echo "MSB=$(vs where --prop=InstallationPath --first -version 16.8)" >> $GITHUB_ENV
+        shell: bash
       - name: 🔽 vs community
         run: vs install community --quiet +Microsoft.VisualStudio.Component.ManagedDesktop.Core	+Microsoft.NetCore.Component.DevelopmentTools
         if: env.MSB == ''
       - name: ≥ msbuild
         run: echo "$(vs where --prop=InstallationPath --first -version 16.8)\MSBuild\Current\Bin" >> $GITHUB_PATH
+        shell: bash
       - name: 🙏 build
         run: msbuild -r -p:versionsuffix=$($env:VERSION_SUFFIX)
       - name: 🧪 test

.github/workflows/release.yml

@@ -33,11 +33,13 @@ jobs:
         run: dotnet tool update -g dotnet-vs
       - name: 🔍 vs 16.8+
         run: echo "MSB=$(vs where --prop=InstallationPath --first -version 16.8)" >> $GITHUB_ENV
+        shell: bash
       - name: 🔽 vs community
         run: vs install community --quiet +Microsoft.VisualStudio.Component.ManagedDesktop.Core	+Microsoft.NetCore.Component.DevelopmentTools
         if: env.MSB == ''
       - name: ≥ msbuild
         run: echo "$(vs where --prop=InstallationPath --first -version 16.8)\MSBuild\Current\Bin" >> $GITHUB_PATH
+        shell: bash
       - name: 🙏 build
         run: msbuild -r -p:version=$($env:VERSION)
       - name: 🧪 test