Add option to run Skupper Router CI with any provided custom qpid-proton branch

.github/workflows/build.yaml

@@ -19,7 +19,26 @@
 
 name: Build
 
-on: [push, pull_request, workflow_dispatch]
+on:
+  push:
+  pull_request:
+  workflow_dispatch:
+    inputs:
+      protonRepository:
+        description: GitHub repository where to fetch Qpid Proton from
+        type: string
+        default: 'apache/qpid-proton'
+        required: false
+      protonBranch:
+        description: Branch in the protonRepository to check out (in addition to hardcoded branches)
+        type: string
+        default: main
+        required: false
+
+# known limitation https://github.com/actions/runner/issues/480
+env:
+  protonRepository: "${{ github.event.inputs.protonRepository || 'apache/qpid-proton' }}"
+  protonBranch: "${{ github.event.inputs.protonBranch || 'main' }}"
 
 jobs:
   compile:
@@ -31,7 +50,9 @@ jobs:
         os: [ubuntu-20.04]
         buildType: [Debug]
         runtimeCheck: [asan]
-        protonGitRef: [main, 0.37.0]
+        protonGitRef:
+          - ${{ github.event.inputs.protonBranch || 'main' }}
+          - 0.37.0
     env:
       BuildType: ${{matrix.buildType}}
       ProtonBuildDir: ${{github.workspace}}/qpid-proton/build
@@ -71,7 +92,7 @@ jobs:
 
       - uses: actions/checkout@v3
         with:
-          repository: 'apache/qpid-proton'
+          repository: ${{ env.protonRepository }}
           ref: ${{ matrix.protonGitRef }}
           path: 'qpid-proton'
 
@@ -176,7 +197,9 @@ jobs:
         os: [ubuntu-20.04]
         buildType: [Debug]
         runtimeCheck: [asan]
-        protonGitRef: [main, 0.37.0]
+        protonGitRef:
+          - ${{ github.event.inputs.protonBranch || 'main' }}
+          - 0.37.0
         shard: [1, 2]
         shards: [2]
     env:
@@ -273,7 +296,9 @@ jobs:
         containerTag: ['35']
         buildType: [RelWithDebInfo]
         runtimeCheck: [asan, tsan]
-        protonGitRef: [main, 0.37.0]
+        protonGitRef:
+          - ${{ github.event.inputs.protonBranch || 'main' }}
+          - 0.37.0
         shard: [ 1, 2 ]
         shards: [ 2 ]
         include:
@@ -282,14 +307,14 @@ jobs:
             container: 'centos'
             containerTag: stream8
             runtimeCheck: OFF
-            protonGitRef: main
+            protonGitRef: ${{ github.event.inputs.protonBranch || 'main' }}
             shard: 1
             shards: 2
           - os: ubuntu-20.04
             container: 'centos'
             containerTag: stream8
             runtimeCheck: OFF
-            protonGitRef: main
+            protonGitRef: ${{ github.event.inputs.protonBranch || 'main' }}
             shard: 2
             shards: 2
           - os: ubuntu-20.04
@@ -370,7 +395,7 @@ jobs:
 
       - uses: actions/checkout@v3
         with:
-          repository: 'apache/qpid-proton'
+          repository: ${{ env.protonRepository }}
           ref: ${{ matrix.protonGitRef }}
           path: 'qpid-proton'
 
@@ -553,8 +578,8 @@ jobs:
 
       - uses: actions/checkout@v3
         with:
-          repository: 'apache/qpid-proton'
-          ref: main
+          repository: ${{ env.protonRepository }}
+          ref: ${{ env.protonBranch }}
           path: 'qpid-proton'
 
       - name: Install Linux build dependencies