[Testing] Fix docker build (#4109)

* Test fix for ongoing CI issues

(cherry picked from commit 3bf5492cb6)

* Run docker test on PR (temporarily)

* Add token to unit testing env

* Add github token to env file

* Fix for github token

* Ignore blank tokens

* Don't run on PR

.github/workflows/docker.yaml

@@ -21,6 +21,10 @@ on:
     branches:
       - 'master'
 
+  # pull_request:
+  #   branches:
+  #     - 'master'
+
 jobs:
 
   # Build the docker image
@@ -70,6 +74,7 @@ jobs:
           test -f data/secret_key.txt
       - name: Run Unit Tests
         run: |
+          echo "GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}" >> docker.dev.env
           docker-compose run inventree-dev-server invoke test --disable-pty
           docker-compose down
       - name: Set up QEMU

InvenTree/plugin/base/integration/mixins.py

@@ -537,8 +537,11 @@ class APICallMixin:
         headers = {'Content-Type': 'application/json'}
         if getattr(self, 'API_TOKEN_SETTING'):
             token = self.get_setting(self.API_TOKEN_SETTING)
-            headers[self.API_TOKEN] = token
-            headers['Authorization'] = f"{self.API_TOKEN} {token}"
+
+            if token:
+                headers[self.API_TOKEN] = token
+                headers['Authorization'] = f"{self.API_TOKEN} {token}"
+
         return headers
 
     def api_build_url_args(self, arguments: dict) -> str: