Revert "feat(build): Add support for artifact-name in build.yaml"

This reverts commit c1bf35ce1d.

.github/workflows/build-user-config.yml

@@ -55,14 +55,12 @@ jobs:
       - name: Prepare variables
         shell: sh -x {0}
         env:
-          board: ${{ matrix.board }}
           shield: ${{ matrix.shield }}
-          artifact_name: ${{ matrix.artifact-name }}
         run: |
           echo "zephyr_version=${ZEPHYR_VERSION}" >> $GITHUB_ENV
           echo "extra_cmake_args=${shield:+-DSHIELD=\"$shield\"}" >> $GITHUB_ENV
-          echo "display_name=${shield:+$shield - }${board}" >> $GITHUB_ENV
-          echo "artifact_name=${artifact_name:-\"${shield:+$shield-}${board}-zmk\"}" >> $GITHUB_ENV
+          echo "display_name=${shield:+$shield - }${{ matrix.board }}" >> $GITHUB_ENV
+          echo "artifact_name=${shield:+$shield-}${{ matrix.board }}-zmk" >> $GITHUB_ENV
 
       - name: Checkout
         uses: actions/checkout@v3