add skeleton for .github/workflows

.github/workflows/Makefile

@@ -0,0 +1,22 @@
+# Makefile to automatically convert the .jsonnet GHA workflows
+# to .yml (GHA accepts only the YAML format).
+
+LIBS =
+OBJS = build-and-test.yml
+
+all: $(OBJS)
+
+%.yml: %.jsonnet $(LIBS)
+	echo "# AUTOGENERATED FROM $< DO NOT MODIFY" > $@
+	./jsonnet_to_yaml.sh $< >> $@ || { rm -f $@; exit 1; }
+
+clean:
+	rm -f $(OBJS)
+
+# for pad's codemap
+.PHONY: gen-codemapignore
+gen-codemapignore: $(OBJS)
+	rm -f .codemapignore
+	for i in $(OBJS);  do \
+		echo $$i >> .codemapignore; \
+	done

.github/workflows/build-and-test.jsonnet

@@ -0,0 +1,102 @@
+// ----------------------------------------------------------------------------
+// Helpers
+// ----------------------------------------------------------------------------
+
+local checkout = {
+  uses: 'actions/checkout@v3',
+};
+
+local build_script = |||
+        ./configure
+        . ./env
+        mk
+        mk install
+|||;
+
+// ----------------------------------------------------------------------------
+// The jobs
+// ----------------------------------------------------------------------------
+
+// Arch
+local build_x86_linux_arch_job = {
+  'runs-on': 'ubuntu-latest',
+  container: 'archlinux',
+  steps: [
+    checkout,
+    {
+      name: 'Install dependencies',
+      run: |||
+	pacman -Sy --noconfirm gcc lib32-glibc lib32-gcc-libs
+      |||,
+    },
+    {
+      name: 'Build',
+      run: build_script,
+    }
+  ]
+};
+
+// Alpine
+//local build_x86_linux_alpine_job = {
+//  'runs-on': 'ubuntu-latest',
+//  // alpine does not support gcc-multilib like ubuntu/arch
+//  // so simpler to start from a 32 bits alpine image
+//  // But this does not seem to work well with GHA :(
+//  container: 'i386/alpine',
+//  steps: [
+//    checkout,
+//    {
+//      name: 'Install dependencies',
+//      run: |||
+//	apk add bash gcc
+//      |||,
+//    },
+//    {
+//      name: 'Build',
+//      run: build_script,
+//    }
+//  ]
+//};
+
+// Ubuntu
+local build_x86_linux_ubuntu_job = {
+  'runs-on': 'ubuntu-latest',
+  steps: [
+    checkout,
+    {
+      name: 'Install dependencies',
+      run: |||
+	sudo apt update
+	sudo apt-get install -y gcc-multilib
+      |||,
+    },
+    {
+      name: 'Build',
+      run: build_script,
+    }
+  ]
+};
+
+// ----------------------------------------------------------------------------
+// The workflow
+// ----------------------------------------------------------------------------
+{
+  name: 'build-and-test',
+  on: {
+    // can be run manually from the GHA dashboard
+    workflow_dispatch: null,
+    // on the PR
+    pull_request: null,
+    // and another time once the PR is merged on master
+    push: {
+      branches: [
+        'master',
+      ],
+    },
+  },
+  jobs: {
+    'build-x86-linux-arch': build_x86_linux_arch_job,
+    //'build-x86-linux-alpine': build_x86_linux_alpine_job,
+    'build-x86-linux-ubuntu': build_x86_linux_ubuntu_job,
+  },
+}

.github/workflows/build-and-test.yml

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+# AUTOGENERATED FROM build-and-test.jsonnet DO NOT MODIFY
+jobs:
+  build-x86-linux-arch:
+    container: archlinux
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          pacman -Sy --noconfirm gcc lib32-glibc lib32-gcc-libs
+      - name: Build
+        run: |
+          ./configure
+          . ./env
+          mk
+          mk install
+  build-x86-linux-ubuntu:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install dependencies
+        run: |
+          sudo apt update
+          sudo apt-get install -y gcc-multilib
+      - name: Build
+        run: |
+          ./configure
+          . ./env
+          mk
+          mk install
+name: build-and-test
+on:
+  pull_request: null
+  push:
+    branches:
+      - master
+  workflow_dispatch: null

.github/workflows/jsonnet_to_yaml.sh

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+#!/usr/bin/env bash
+
+set -euo pipefail
+
+# This script requires to have:
+#  - jsonnet (any jsonnet should work, e.g., go-jsonnet)
+#  - yq (a.k.a go-yq) from https://github.com/mikefarah/yq
+#    Note that many distributions come with a default yq that is not
+#    as powerful as https://github.com/mikefarah/yq so follow
+#    the instructions there to install yq on your machine
+#
+# The sed command is because 'on' is printed with or without quotes depending
+# on the version. It's a dirty hack that may break some input.
+
+jsonnet "$@" \
+| yq eval -P \
+| sed -e 's/^\( *\)"on":/\1on:/' \
+| sed -e 's/: "yes"$/: yes/'