ci/lin: install to system, not HOME

.github/workflows/test.yml

@@ -30,14 +30,12 @@ jobs:
     - name: Build
       run: |
         autoconf
-        ./configure --prefix=$HOME
-        make install
+        ./configure
+        sudo make install
         make check
 
     - name: Test
-      run: |
-        export PATH=$HOME/bin:$PATH
-        sh .github/test.sh
+      run: sh .github/test.sh
 
 
   win: