Introduce GitHub Action workflow for UK Met Office (#2354)

* setup github actions
* try again after adding cmake-jedi to ukmo runner group
* address review suggestions
* rename workflow for consistency

.github/workflows/ci.yml

@@ -0,0 +1,34 @@
+---
+name: UKMO-CI-Az
+
+on:
+  push:
+    branches: [develop]
+  pull_request:
+    branches: [develop]
+
+jobs:
+  build-and-test:
+    runs-on: jedi-self-hosted-ext
+    steps:
+      - name: checkout current repo
+        uses: actions/checkout@v3
+        with:
+          path: CI/meto/oops
+          repository: JCSDA-internal/oops
+
+      - name: checkout jedicmake
+        uses: actions/checkout@v3
+        with:
+          path: CI/meto/jedicmake
+          repository: JCSDA/jedi-cmake
+          submodules: true
+
+      - name: build and test
+        run: |
+          az acr login --name ngmssboxjediacr
+          docker run --rm \
+            --entrypoint=/usr/local/src/oops-ci/build-and-test \
+            --workdir=/usr/local/src/oops-ci/ \
+            --volume $PWD/CI/meto:/usr/local/src/oops-ci \
+            'ngmssboxjediacr.azurecr.io/jedibase:alma9'

CI/meto/CMakeLists.txt

@@ -0,0 +1,15 @@
+cmake_minimum_required(VERSION 3.20 FATAL_ERROR)
+
+project(oops-ci VERSION 1.0.0 LANGUAGES C CXX Fortran)
+
+set(ENABLE_MPI ON CACHE BOOL "Compile with MPI")
+set(ENABLE_OMP ON CACHE BOOL "Compile with OpenMP")
+
+add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/jedicmake")
+if(NOT DEFINED jedicmake_DIR)
+  set(jedicmake_DIR "${CMAKE_BINARY_DIR}/jedicmake")
+endif()
+add_subdirectory("${CMAKE_CURRENT_SOURCE_DIR}/oops")
+
+include(CTest)
+enable_testing()

CI/meto/build-and-test

@@ -0,0 +1,37 @@
+#!/bin/bash
+set -euo pipefail
+
+finally() {
+    trap '' ERR
+    trap '' EXIT
+    if [[ -d "${WORKD:-}" ]]; then
+        cd /
+        rm -fr "${WORKD}"
+    fi
+}
+
+HERE="$(cd "$(dirname "$0")" && pwd)"
+THIS="$(basename "$0")"
+NPROC=${NPROC:-$(nproc)}
+WORKD="$(mktemp -d "${THIS}-XXXXXX" -t)"
+
+trap finally ERR
+trap finally EXIT
+
+cd "${WORKD}"
+
+rm -f "${HERE}/bundle"
+ln -s '..' "${HERE}/bundle"
+
+# -- Configure
+cmake -B . -S "${HERE}" -DCMAKE_BUILD_TYPE=Debug -DMPI_ARGS="--oversubscribe"
+
+# -- Build
+# VERBOSE=1 cmake --build . -j "${NPROC}"
+cmake --build . -j "${NPROC}"
+
+# -- Test
+env OMPI_ALLOW_RUN_AS_ROOT=1 OMPI_ALLOW_RUN_AS_ROOT_CONFIRM=1 \
+    ctest -j "$NPROC" --output-on-failure --test-dir './oops'
+
+exit

CI/meto/get-ref-branch

@@ -0,0 +1,20 @@
+#!/bin/bash
+set -euxo pipefail
+repo="$1"  # expect path to a repo clone
+
+branch_name="${GITHUB_HEAD_REF}"
+if [[ "${branch_name}" == 'develop' ]]; then
+    exit
+fi
+
+# Attempt to checkout a branch from a dependency project with the same name as
+# the branch triggering this GitHub Actions workflow.
+cd "${repo}"
+if git fetch --progress --depth=1 origin \
+    "+refs/heads/${branch_name}:refs/remotes/origin/${branch_name}"
+then
+    git checkout --progress --force -B "${branch_name}" \
+        "refs/remotes/origin/${branch_name}"
+fi
+
+exit