GhA: build: update before apt-get install

Fix pre-merge build workflow: on installing `inxi` package
during the build step `Print runner system info`, `apt-get update`
needs to be run before `apt-get install` to make sure apt index is
not stale.

Signed-off-by: Henri Rosten <henri.rosten@unikie.com>

.github/workflows/build.yml

@@ -134,7 +134,7 @@ jobs:
           echo "Available storage after cleanup:"
           df -h
       - name: Print runner system info
-        run: sudo apt-get install -y inxi; sudo inxi -c0 --width -1 --basic --memory-short
+        run: sudo apt-get update; sudo apt-get install -y inxi; sudo inxi -c0 --width -1 --basic --memory-short
       - name: Checkout
         uses: actions/checkout@v4
         with: