Force proper ScmRevDesc on Mac (hacky, may fix better later)

Author: Motobug

.github/workflows/ci.yml

@@ -24,6 +24,7 @@ jobs:
           HOMEBREW_NO_INSTALL_CLEANUP: 1
           HOMEBREW_NO_ANALYTICS: 1
         run: |
+          brew install gnu-sed
           if ! brew install ccache ninja; then
             brew update
             brew install ccache ninja
@@ -111,6 +112,13 @@ jobs:
                 "${COMMON_ARGS[@]}" \
                 -B build-arm .
 
+      - name: Dolphin-Build Number
+        run: |
+          export LASTCOMMIT=$(git log --pretty=format:%H -1)
+          export DOLPHINVER="v3.1.2-mainline-beta.2"
+          echo "DOLPHIN Build $DOLPHINVER"
+          echo "DOLPHINVER=$DOLPHINVER" >> $GITHUB_ENV
+          gsed -i "s|\${DOLPHIN_WC_DESCRIBE}|$DOLPHINVER|g" Source/Core/Common/scmrev.h.in
       - name: Build Dolphin (x86_64)
         working-directory: build
         run: |