ci: Move build job script to a separate file

Will make it easier to do more complex shell stuff.

No functional change intended.

v2:
* Use /bin/bash instead of /bin/sh (Peter Hutterer)
* Export environment variables on a separate line (Peter)
* Use "set" command instead of shell command line arguments, for
  consistency with debian-install.sh.

.gitlab-ci.yml

@@ -76,9 +76,7 @@ debian-bullseye:
 meson:
     extends: .common-build-and-test
     script:
-        - meson -Dc_args="-fno-common" -Dprefix=/usr -Dxephyr=true -Dwerror=true $MESON_EXTRA_OPTIONS build/
+        - .gitlab-ci/build-and-test.sh
-        - ninja -j${FDO_CI_CONCURRENT:-4} -C build/ dist
-        - PIGLIT_DIR=/root/piglit XTEST_DIR=/root/xts ninja -j${FDO_CI_CONCURRENT:-4} -C build/ test
         - .gitlab-ci/manpages-check
 
 meson-noglamor:

.gitlab-ci/build-and-test.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e
+set -o xtrace
+
+meson -Dc_args="-fno-common" -Dprefix=/usr -Dxephyr=true -Dwerror=true $MESON_EXTRA_OPTIONS build/
+
+ninja -j${FDO_CI_CONCURRENT:-4} -C build/ dist
+
+export PIGLIT_DIR=/root/piglit XTEST_DIR=/root/xts
+ninja -j${FDO_CI_CONCURRENT:-4} -C build/ test