Fix working directory

.github/workflows/build.yaml

@@ -42,6 +42,7 @@ jobs:
           rm xbps-static-latest.x86_64-musl.tar.xz
 
       - name: Prepare masterdir
+        working-directory: upstream-packages
         run: |
           export PATH="/tmp/bin:/opt/xbps/usr/bin/:$PATH"
           common/travis/set_mirror.sh &&
@@ -55,9 +56,9 @@ jobs:
           sudo rm -rf /opt/hostedtoolcache/CodeQL
 
       - name: build
+        working-directory: upstream-packages
         run: |
           export PATH="/tmp/bin:/opt/xbps/usr/bin/:$PATH"
-          cd upstream-packages
           ./xbps-src -m masterdir-${{ matrix.arch }} -A ${{ matrix.arch }} binary-bootstrap
           ./xbps-src pkg -j4 -m masterdir-${{ matrix.arch }} dotter-bin