ci: correctly update system before installing new packages

Author: Duncaen

.github/workflows/ci.yaml

@@ -30,7 +30,7 @@ jobs:
          - uses: actions/checkout@v1
          - name: Prepare container
            run: |
-            xbps-install -Syu || xbps-install -yu xbps
+            xbps-install -Syu xbps; xbps-install -Syu
             xbps-install -Sy ${{ matrix.c_compiler }} ${{ matrix.extra_deps }} make pkg-config zlib-devel openssl-devel libarchive-devel kyua atf-devel
          - name: Build
            env:

.github/workflows/doxygen.yaml

@@ -21,7 +21,7 @@ jobs:
     steps:
       - name: Prepare container
         run: |
-          xbps-install -Syu || xbps-install -yu xbps
+          xbps-install -Syu xbps; xbps-install -Syu
           xbps-install -Sy bash git gcc make pkg-config zlib-devel openssl-devel libarchive-devel doxygen graphviz
       - uses: classabbyamp/treeless-checkout-action@v1
       - name: Build