CI (Buildkite): on pull request builds, build the merge commit (e.g. refs/pull/1234/merge)

Author: DilumAluthge

.buildkite/pipelines/experimental/launch_unsigned_builders.yml

@@ -1,6 +1,7 @@
 steps:
   - label: ":buildkite: Launch unsigned pipelines"
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       buildkite-agent pipeline upload .buildkite/pipelines/experimental/misc/sanitizers.yml
     agents:
       queue: julia

.buildkite/pipelines/experimental/misc/sanitizers.yml

@@ -21,5 +21,6 @@ steps:
           version: 1.6
     timeout_in_minutes: 120
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       echo "--- Build julia-debug with ASAN"
       contrib/asan/build.sh ./tmp/test-asan -j$${JULIA_CPU_THREADS:?} debug

.buildkite/pipelines/main/launch_unsigned_builders.yml

@@ -15,6 +15,8 @@
 steps:
   - label: ":buildkite: Launch unsigned builders"
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
+
       # Launch the `whitespace` builder first, because we want that builder to finish as quickly as possible.
       buildkite-agent pipeline upload .buildkite/pipelines/main/misc/whitespace.yml
 

.buildkite/pipelines/main/misc/doctest.yml

@@ -18,6 +18,7 @@ steps:
             # Include `/cache/repos` so that our `git` version introspection works.
             - "/cache/repos:/cache/repos"
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       echo "--- Build Julia from source"
       make -j 6
 

.buildkite/pipelines/main/misc/embedding.yml

@@ -18,6 +18,7 @@ steps:
             # Include `/cache/repos` so that our `git` version introspection works.
             - "/cache/repos:/cache/repos"
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       prefix="/tmp/prefix"
       echo "+++ Build julia, deploy to $${prefix:?}"
       make -j$${JULIA_CPU_THREADS:?} JULIA_PRECOMPILE=0 prefix=$${prefix:?} install

.buildkite/pipelines/main/misc/llvmpasses.yml

@@ -16,6 +16,7 @@ steps:
             # Include `/cache/repos` so that our `git` version introspection works.
             - "/cache/repos:/cache/repos"
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       echo "--- Install in-tree LLVM dependencies"
       make -j$${JULIA_CPU_THREADS:?} -C deps install-llvm install-clang install-llvm-tools install-libuv install-utf8proc install-unwind
       echo "+++ run clangsa/analyzegc"
@@ -35,6 +36,7 @@ steps:
           workspaces:
             - "/cache/repos:/cache/repos"
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       echo "--- make release"
       make -j$${JULIA_CPU_THREADS:?} release JULIA_PRECOMPILE=0
       echo "--- make src/install-analysis-deps"

.buildkite/pipelines/main/misc/whitespace.yml

@@ -19,4 +19,5 @@ steps:
       - github_commit_status:
           context: "whitespace"
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       make -j$${JULIA_CPU_THREADS:?} check-whitespace

.buildkite/pipelines/main/platforms/package_linux.yml

@@ -21,6 +21,8 @@ steps:
             - "/cache/repos:/cache/repos"
     timeout_in_minutes: ${TIMEOUT?}
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
+
       echo "--- Print the full and short commit hashes"
       SHORT_COMMIT_LENGTH=10
       SHORT_COMMIT=`echo $${BUILDKITE_COMMIT:?} | cut -c1-$${SHORT_COMMIT_LENGTH:?}`

.buildkite/pipelines/main/platforms/tester_linux.yml

@@ -24,6 +24,7 @@ steps:
       JULIA_SHELL: "/bin/bash"
     timeout_in_minutes: ${TIMEOUT?}
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
       echo "--- Print the full and short commit hashes"
       SHORT_COMMIT_LENGTH=10
       SHORT_COMMIT=`echo $${BUILDKITE_COMMIT:?} | cut -c1-$${SHORT_COMMIT_LENGTH:?}`

.buildkite/pipelines/scheduled/coverage/coverage_linux64.yml

@@ -18,6 +18,8 @@ steps:
           uid: 1000
           gid: 1000
     commands: |
+      MCSH=.buildkite/utilities/merge_commit/merge_commit.sh && test -f $${MCSH:?} && bash $${MCSH:?}
+
       echo "--- Build Julia from source"
       make -j 6