CI: set QED dependencies for doc build to dev branch version, if targ…

…et branch is not main (#95)

This [QED.jl PR](QEDjl-project/QuantumElectrodynamics.jl#44)
required before we can merge this PR.

.github/workflows/BuildDeployDoc.yml

@@ -22,6 +22,11 @@ jobs:
       - name: Install dependencies
         run: |
           julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
+      - name: set dependencies to dev branch version
+        if: (github.event_name == 'push' && github.ref_name != 'main') || (github.event_name == 'pull_request' && github.base_ref != 'main')
+        run: |
+          git clone -b dev https://github.com/QEDjl-project/QED.jl.git /tmp/integration_test_tools
+          julia --project=docs/ /tmp/integration_test_tools/.ci/set_dev_dependencies.jl
       - name: Build and deploy
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # If authenticating with GitHub Actions token