Add action for performing downstream tests (#77)

* add downstream testing

* don't run on draft PRs

Author: lkdvos

.github/workflows/Downstream.yml

@@ -0,0 +1,60 @@
+name: IntegrationTest
+on:
+  push:
+    branches: [main]
+    tags: [v*]
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+jobs:
+  test:
+    name: ${{ matrix.package.user }}/${{ matrix.package.repo }}
+    if: github.event.pull_request.draft == false
+    runs-on: ${{ matrix.os }}
+    env:
+      GROUP: ${{ matrix.package.group }}
+    strategy:
+      fail-fast: false
+      matrix:
+        julia-version: ['1.10']
+        os: [ubuntu-latest]
+        package:
+          - {user: QuantumKitHub, repo: SUNRepresentations.jl}
+          - {user: QuantumKitHub, repo: QWignerSymbols.jl}
+          - {user: QuantumKitHub, repo: CategoryData.jl}
+
+    steps:
+      - uses: actions/checkout@v6
+      - uses: julia-actions/setup-julia@v2
+        with:
+          version: ${{ matrix.julia-version }}
+          arch: x64
+      - uses: julia-actions/julia-buildpkg@latest
+      - name: Clone Downstream
+        uses: actions/checkout@v6
+        with:
+          repository: ${{ matrix.package.user }}/${{ matrix.package.repo }}
+          path: downstream
+      - name: Load this and run the downstream tests
+        shell: julia --color=yes --project=downstream --depwarn=yes {0}
+        run: |
+          using Pkg
+          try
+            # force it to use this PR's version of the package
+            Pkg.develop(PackageSpec(path="."))  # resolver may fail with main deps
+            Pkg.update()
+            Pkg.test(coverage=true)  # resolver may fail with test time deps
+          catch err
+            err isa Pkg.Resolve.ResolverError || rethrow()
+            # If we can't resolve that means this is incompatible by SemVer and this is fine
+            # It means we marked this as a breaking change, so we don't need to worry about
+            # Mistakenly introducing a breaking change, as we have intentionally made one
+            @info "Not compatible with this release. No problem." exception=err
+            exit(0)  # Exit immediately, as a success
+          end
+      - uses: julia-actions/julia-processcoverage@v1
+      - uses: codecov/codecov-action@v5
+        with:
+          files: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
+          fail_ci_if_error: false