install phx_new before compiling deps

Author: magnetised

.github/workflows/elixir_tests.yml

@@ -68,13 +68,13 @@ jobs:
             ${{ runner.os }}-build-${{ env.MIX_ENV }}-
             ${{ runner.os }}-build-
 
-      - name: Install dependencies
-        run: mix deps.get && mix deps.compile
-
       # needed for the igniter tests
       - name: Install phx.new task
         run: mix archive.install hex phx_new --force
 
+      - name: Install dependencies
+        run: mix deps.get && mix deps.compile
+
       - name: Compiles without warnings
         run: mix compile --force --all-warnings --warnings-as-errors