Add simple GitHub Action CI.

This runs only on push in selected branches.

(Not for push requests, we do not use PR on GitHub.)

.github/workflows/cibuild-setup-ubuntu.sh

@@ -0,0 +1,28 @@
+#!/bin/bash
+
+set -ex
+
+PACKAGES=(
+	git make autoconf automake autopoint pkg-config libtool libtool-bin
+	gettext libssl-dev libdevmapper-dev libpopt-dev uuid-dev libsepol1-dev
+	libjson-c-dev libssh-dev libblkid-dev tar libargon2-0-dev libpwquality-dev
+	sharutils dmsetup jq xxd expect keyutils netcat passwd openssh-client sshpass
+)
+
+COMPILER="${COMPILER:?}"
+COMPILER_VERSION="${COMPILER_VERSION:?}"
+RELEASE="$(lsb_release -cs)"
+
+bash -c "echo 'deb-src http://archive.ubuntu.com/ubuntu/ $RELEASE main restricted universe multiverse' >>/etc/apt/sources.list"
+
+# Latest gcc stack deb packages provided by
+# https://launchpad.net/~ubuntu-toolchain-r/+archive/ubuntu/test
+add-apt-repository -y ppa:ubuntu-toolchain-r/test
+PACKAGES+=(gcc-$COMPILER_VERSION)
+
+# scsi_debug, gost crypto
+PACKAGES+=(dkms linux-headers-$(uname -r) linux-modules-extra-$(uname -r) gost-crypto-dkms)
+
+apt-get -y update --fix-missing
+apt-get -y install "${PACKAGES[@]}"
+apt-get -y build-dep cryptsetup