docker: switch to Alpine Linux for the master image

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

Changed:
- switch base image from Debian:Jessie to Alpine:3.6
- switch to PHP 7.1
- switch from supervisord to s6 to manage services

See:
- https://alpinelinux.org/
- https://wiki.alpinelinux.org/wiki/Nginx_with_PHP
- http://www.skarnet.org/software/s6/
  - http://www.skarnet.org/software/s6/s6-svscan.html
  - http://www.skarnet.org/software/s6/s6-svc.html
  - http://www.skarnet.org/software/s6/s6-svstat.html

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

3 files changed, 6 insertions, 0 deletions

diff --git a/docker/alpine/services.d/.s6-svscan/finish b/docker/alpine/services.d/.s6-svscan/finish
new file mode 100755
index 00000000..1dadeeaf
--- /dev/null
+++ b/docker/alpine/services.d/.s6-svscan/finish
@@ -0,0 +1,2 @@
+#!/bin/sh
+/bin/true
diff --git a/docker/alpine/services.d/nginx/run b/docker/alpine/services.d/nginx/run
new file mode 100755
index 00000000..21e7b0d6
--- /dev/null
+++ b/docker/alpine/services.d/nginx/run
@@ -0,0 +1,2 @@
+#!/bin/execlineb -P
+nginx
diff --git a/docker/alpine/services.d/php-fpm/run b/docker/alpine/services.d/php-fpm/run
new file mode 100755
index 00000000..21dd0107
--- /dev/null
+++ b/docker/alpine/services.d/php-fpm/run
@@ -0,0 +1,2 @@
+#!/bin/execlineb -P
+php-fpm7 -F