WIP: Provide a Docker Compose example

Closes #1010

TODO:
- deploy on a VPS with an actual domain
- write a supporting deployment guide / article

See:
- https://hub.docker.com/r/jwilder/nginx-proxy/
- https://hub.docker.com/r/jrcs/letsencrypt-nginx-proxy-companion/
- https://docs.docker.com/compose/environment-variables/

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

.dockerignore

@@ -4,6 +4,10 @@
 .github
 tests
 
+# Docker Compose resources
+docker-compose.env
+docker-compose.yml
+
 # Shaarli runtime resources
 cache/*
 data/*

.gitattributes

@@ -35,6 +35,7 @@ doc/**/*.json     export-ignore
 doc/**/*.md       export-ignore
 .docker/          export-ignore
 .dockerignore     export-ignore
+docker-compose.*  export-ignore
 Dockerfile*       export-ignore
 Doxyfile          export-ignore
 Makefile          export-ignore

docker-compose.env

@@ -0,0 +1,2 @@
+SHAARLI_VIRTUAL_HOST=shaarli.local
+SHAARLI_LETSENCRYPT_EMAIL=foo@bar.com

docker-compose.yml

@@ -0,0 +1,47 @@
+---
+version: '3'
+
+services:
+  shaarli:
+    image: shaarli/shaarli:master
+    build: ./
+    networks:
+      - proxy
+    volumes:
+      - shaarli-data:/var/www/shaarli/data
+    environment:
+      - "VIRTUAL_HOST=${SHAARLI_VIRTUAL_HOST}"
+      - "LETSENCRYPT_HOST=${SHAARLI_VIRTUAL_HOST}"
+      - "LETSENCRYPT_EMAIL=${SHAARLI_LETSENCRYPT_EMAIL}"
+
+  nginx-proxy:
+    image: jwilder/nginx-proxy:alpine
+    labels:
+      - com.github.jrcs.letsencrypt_nginx_proxy_companion.nginx_proxy
+    networks:
+      - proxy
+    ports:
+      - 80:80
+      - 443:443
+    volumes:
+      - nginx-certs:/etc/nginx/certs:ro
+      - nginx-html:/usr/share/nginx/html
+      - nginx-vhosts:/etc/nginx/vhost.d
+      - /var/run/docker.sock:/tmp/docker.sock:ro
+
+  nginx-proxy-companion:
+    image: jrcs/letsencrypt-nginx-proxy-companion:stable
+    volumes:
+      - nginx-certs:/etc/nginx/certs:rw
+      - nginx-html:/usr/share/nginx/html
+      - nginx-vhosts:/etc/nginx/vhost.d
+      - /var/run/docker.sock:/var/run/docker.sock:ro
+
+volumes:
+  nginx-certs:
+  nginx-html:
+  nginx-vhosts:
+  shaarli-data:
+
+networks:
+  proxy: