ci: change periodic.yml to also install valgrind too

.github/workflows/periodic.yml

@@ -10,9 +10,9 @@ jobs:
     steps:
     - uses: actions/checkout@v2
     - name: Install dependencies
-      run: sudo apt-get install --quiet -y libssl-dev sqlite3 libsqlite3-dev 
+      run: sudo apt-get install --quiet -y libssl-dev sqlite3 libsqlite3-dev valgrind
     - name: Build v
-      run: make -j4 && ./v -cg -o v cmd/v
+      run: make -j4
     - name: Symlink V
       run:  sudo ./v symlink
     - name: Run network tests