ci(setup-deps): always use sccache, simplify restore key

sccache is available on arm runners. we can use the restore key for an
easy, unique restore key in the cache too (it also prevents us from
re-using the ccache caches!)

Signed-off-by: Seth Flynn <getchoo@tuta.io>

.github/actions/setup-dependencies/action.yml

@@ -6,6 +6,9 @@ inputs:
     description: Type for the build
     required: true
     default: Debug
+  artifact-name:
+    description: Name of the uploaded artifact
+    required: true
   msystem:
     description: MSYS2 subsystem to use
     required: false
@@ -53,16 +56,16 @@ runs:
       if: ${{ (runner.os != 'Windows' || inputs.msystem == '') && inputs.build-type == 'Debug' }}
       uses: hendrikmuhs/ccache-action@v1.2.18
       with:
-        variant: ${{ runner.os == 'Windows' && 'sccache' || 'ccache' }}
+        variant: sccache
         create-symlink: ${{ runner.os != 'Windows' }}
-        key: ${{ runner.os }}-qt${{ inputs.qt_ver }}-${{ inputs.architecture }}
+        key: ${{ runner.os }}-${{ runner.arch }}-${{ inputs.artifact-name }}-sccache
 
     - name: Use ccache on debug builds
       if: ${{ inputs.build-type == 'Debug' }}
       shell: bash
       env:
-        # Only use sccache on MSVC
-        CCACHE_VARIANT: ${{ (runner.os == 'Windows' && inputs.msystem == '') && 'sccache' || 'ccache' }}
+        # Only use ccache on MSYS2
+        CCACHE_VARIANT: ${{ (runner.os == 'Windows' && inputs.msystem != '') && 'ccache' || 'sccache' }}
       run: |
         echo "CMAKE_C_COMPILER_LAUNCHER=$CCACHE_VARIANT" >> "$GITHUB_ENV"
         echo "CMAKE_CXX_COMPILER_LAUNCHER=$CCACHE_VARIANT" >> "$GITHUB_ENV"