.github/workflows/build.yml: install ccache manually

This eliminates the additionoal "apt-get install" call by
ccache-action.

Author: MaxKellermann

.github/workflows/build.yml

@@ -29,20 +29,21 @@ jobs:
         with:
           submodules: true
 
-      - id: cache-ccache
-        uses: hendrikmuhs/ccache-action@v1
-
       - name: Install dependencies
         run: |
           sudo apt-get update
           sudo apt-get install -y --no-install-recommends \
             meson \
+            ccache \
             libavahi-client-dev \
             libgeoip-dev \
             libgtest-dev \
             libsystemd-dev \
             libz-dev
 
+      - id: cache-ccache
+        uses: hendrikmuhs/ccache-action@v1
+
       - name: Configure
         run: |
           meson setup \