Add installation from Github for upstream packages

.github/workflows/code.yml

@@ -55,7 +55,7 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-13]
         python: [cp37, cp38, cp39, cp310, cp311, cp312]
-
+        use_master: [false, true] # Use p4p, pvxslibs, epicscorelibs master branches
 
         include:
           # Put coverage and results files in the project directory for mac
@@ -90,6 +90,10 @@ jobs:
       - name: Install Python Dependencies
         run: pip install build cibuildwheel>=2.16.2
 
+      - name: Install packages from Github
+        if: ${{ matrix.use_master }}
+        run: pip install git+https://github.com/epics-base/epicscorelibs.git git+https://github.com/epics-base/pvxs.git git+https://github.com/epics-base/p4p.git
+
       - name: Build Wheel
         run: cibuildwheel --output-dir dist
         env: