docker: add alpine,debian,ubuntu test images

Relates to https://github.com/shaarli/Shaarli/issues/843

Added:
- Makefile target to run commands in a Docker test context
- Docker images to run Shaarli test suites:
  - Alpine 3.6
  - Debian 8
  - Debian 9
  - Ubuntu 16.04
- Documentation

Signed-off-by: VirtualTam <virtualtam@flibidi.net>

1 files changed, 10 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index 40badb1d..a3696ec9 100644
--- a/Makefile
+++ b/Makefile
@@ -19,6 +19,16 @@ PHP_COMMA_SOURCE = index.php,application,tests,plugins
 all: static_analysis_summary check_permissions test
 
 ##
+# Docker test adapter
+#
+# Shaarli sources and vendored libraries are copied from a shared volume
+# to a user-owned directory to enable running tests as a non-root user.
+##
+docker_%:
+        rsync -az /shaarli/ ~/shaarli/
+        cd ~/shaarli && make $*
+
+##
 # Concise status of the project
 # These targets are non-blocking: || exit 0
 ##