Run Cygwin tests in only one part

Author: jmid

.github/workflows/cygwin-51x.yml

@@ -3,22 +3,10 @@ name: Cygwin 5.1
 on: [push, pull_request, workflow_dispatch]
 
 jobs:
-  part1:
+  build:
     uses: ./.github/workflows/common.yml
     with:
       runs_on: windows-latest
       compiler: ocaml-variants.5.1.1~rc1+options+win
       cygwin: true
       timeout: 360
-      dune_alias: 'ci1'
-
-  part2:
-    needs: part1
-    if: ${{ always() && needs.part1.outputs.skippart2 != 'true' }}
-    uses: ./.github/workflows/common.yml
-    with:
-      runs_on: windows-latest
-      compiler: ocaml-variants.5.1.1~rc1+options+win
-      cygwin: true
-      timeout: 360
-      dune_alias: 'ci2'

.github/workflows/cygwin-520-trunk.yml

@@ -3,24 +3,11 @@ name: Cygwin trunk
 on: [push, pull_request, workflow_dispatch]
 
 jobs:
-  part1:
+  build:
     uses: ./.github/workflows/common.yml
     with:
       runs_on: windows-latest
       compiler: ocaml.5.2.0
       cygwin: true
       compiler_git_ref: refs/heads/trunk
       timeout: 360
-      dune_alias: 'ci1'
-
-  part2:
-    needs: part1
-    if: ${{ always() && needs.part1.outputs.skippart2 != 'true' }}
-    uses: ./.github/workflows/common.yml
-    with:
-      runs_on: windows-latest
-      compiler: ocaml.5.2.0
-      cygwin: true
-      compiler_git_ref: refs/heads/trunk
-      timeout: 360
-      dune_alias: 'ci2'