Create downstream.yml

.github/workflows/downstream.yml

@@ -0,0 +1,54 @@
+name: Test Dependency Graph
+
+on:
+  workflow_dispatch:
+    inputs: 
+      os:
+        type: choice
+        description: OS
+        options:
+        - ubuntu-latest
+        - macos-latest
+        - windows-latest
+      swift-version:
+        type: choice
+        description: Swift Version
+        options:
+        - '5.9'
+        - '5.8'
+        - '5.7'
+        - '5.6'
+        - '5.5'
+        - '5.4'
+        - '5.3'
+        - '5.2'
+        - '5.1'
+        - '5.0'
+
+jobs:
+  test-dependants:
+    strategy:
+      fail-fast: false
+      matrix:
+        provider:
+          - swift-libp2p/swift-cid
+        os: [ ${{ github.event.inputs.os }} ]
+        swift: [ '${{ github.event.inputs.swift-version }}' ]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Check out swift-multihash
+        uses: actions/checkout@v4
+        with:
+          path: swift-multihash
+      - name: Check out provider
+        uses: actions/checkout@v4
+        with:
+          repository: ${{ matrix.provider }}
+          path: provider
+          ref: ${{ matrix.ref }}
+      - name: Use local swift-multihash
+        run: swift package --package-path ./provider edit swift-multihash --path ./swift-multihash
+      - name: Run tests
+        env:
+            SWIFT_DETERMINISTIC_HASHING: 1
+        run: swift test --package-path ./provider