ci: fix some things

Author: foosel

.github/workflows/build.yml

@@ -72,10 +72,9 @@ jobs:
 
       - name: 🏗 Install OctoPrint
         run: |
-          pip install dist/*.whl
-
           cd OctoPrint
           pip install .
+          pip install ${{ github.workspace }}/dist/*.whl
 
       - name: 🏗 Create base config for test server
         run: |
@@ -85,7 +84,7 @@ jobs:
       - name: 🏗 Install dummy mfa plugin
         run: |
           mkdir -p e2econfig/plugins
-          cp -r .github/fixtures/mfa_dummy e2econfig/plugins/mfa_dummy
+          cp -r OctoPrint/.github/fixtures/mfa_dummy e2econfig/plugins/mfa_dummy
 
       - name: 🏗 Prepare Playwright env
         working-directory: ./OctoPrint/tests/playwright