ci: add a release script

This is the start of a release script. The idea is to automate
a whole bunch of the steps documented in ci/RELEASE.md, so that
a release becomes more straightforward. Assumptions abound:
basically this is going to work on my workstation, and not
on any other.

ci/RELEASE.sh

@@ -0,0 +1,23 @@
+#! /bin/sh
+#
+# Release script for Calamares
+#
+# This attempts to perform the different steps of the RELEASE.md
+# document automatically. It's not tested on other machines or
+# setups other than [ade]'s development VM.
+# 
+# Assumes that the version in CMakeLists.txt has been bumped,
+# and that a release of that version is desired.
+
+test -d .git || { echo "Not at top-level." ; exit 1 ; }
+test -d src/modules || { echo "No src/modules." ; exit 1 ; }
+
+which cmake > /dev/null 2>&1 || { echo "No cmake(1) available." ; exit 1 ; }
+
+rm -rf build
+mkdir build || { echo "Could not create build directory." ; exit 1 ; }
+( cd build && cmake .. && make -j4 ) || { echo "Could not perform test-build." ; exit 1 ; }
+( cd build && make test ) || { echo "Tests failed." ; exit 1 ; }
+
+
+