POC: Introduce Nextcloud based on Nginx web server.

This PR introduce POC of Nextcloud based on Nginx web server with php-fpm in separated container.
Basic installation with SQLite and few operations in web gui were tested.

Nginx dockerfile is generated from Dockerfile-nginx.template
  - FROM string has hardcoded variant - apache
  - There is no upstream PHP image with Nginx, due this generate-stackbrew-library is not able to identify parent correctly

New files were introduced in image:
  - Dockerfile-nginx.template
  - nginx-foreground
    + simulates behavior of apache2-foreground cmd
  - 16.0/nginx/Dockerfile
    + generated from template Dockerfile-nginx.template
  - nextcloud.confx
    + Nginx vhost configuration
  - start_net.sh (temporary)
    + Helper script to create user-defined network for Docker
    + '--link' option for docker create is obsolete and we need communication between fpm and nginx container
  - start_container.sh (temporary)
    + Helper script to handle containers
  - Dockerfile
    + /Dockerfile for verification purposes
Updated files:
  - set -x added to all shell scripts for easier troubleshooting (temporary)
  - update.sh
    + New variant introduced
    + Number of builded variant is limited for simplified CI.
  - .travis.yml (temporary)
    + Image push to registry for testing purposes
  - docker-entrypoint.sh
    + Recognizes new argument for entrypoint - nginx-foreground

Be careful during review, github recognizes removed files for 15.0 release as renamed to 16.0/nginx variant

Motivation/Usecase:
  - I have openvz based VPS where only old Docker 1.10 is supported.
  - Apache(in nextcloud container) in combination Nginx as a reverse proxy for multiple vhosts doesn't work correctly

Image pull link:
docker pull 1john2ci/nextcloud:apache-20190509
docker pull 1john2ci/nextcloud:fpm-20190509
Travis CI test: https://travis-ci.org/1john2/docker/builds/530329740

Deployment notes:
  - Clone source code
  - Create user-defined network for Docker
  - Start fpm container
  - Start nginx container

Signed-off-by: Malanik Jan <malanik.jan@gmail.com>

.travis.yml

@@ -32,14 +32,14 @@ after_script:
 # ##
   - echo "1john2_password" | docker login -u "1john2ci" --password-stdin
 
-  - docker tag nextcloud:16.0-apache 1john2ci/nextcloud:apache-ncd-20190509
+  - docker tag nextcloud:16.0-apache 1john2ci/nextcloud:apache-ncd-20190510
-  - docker push 1john2ci/nextcloud:apache-ncd-20190509
+  - docker push 1john2ci/nextcloud:apache-ncd-20190510
 
-  - docker tag nextcloud:16.0-nginx 1john2ci/nextcloud:nginx-ncd-20190509
+  - docker tag nextcloud:16.0-nginx 1john2ci/nextcloud:nginx-ncd-20190510
-  - docker push 1john2ci/nextcloud:nginx-ncd-20190509
+  - docker push 1john2ci/nextcloud:nginx-ncd-20190510
 
-  - docker tag nextcloud:16.0-fpm-full 1john2ci/nextcloud:fpm-ncd-20190509
+  - docker tag nextcloud:16.0-fpm-full 1john2ci/nextcloud:fpm-ncd-20190510
-  - docker push 1john2ci/nextcloud:fpm-ncd-20190509
+  - docker push 1john2ci/nextcloud:fpm-ncd-20190510
 
 jobs:
   include:

16.0/apache/Dockerfile

@@ -1,6 +1,24 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-debian.template
 FROM php:7.3-apache-stretch
 
+# ##
+# Install standard troubleshooting utils
+# We can't remove apache2 - it brokes build for fpm/apache containers
+# ##
+RUN set -ex; \
+    \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        vim \
+        net-tools \
+        iproute2 \
+        iputils-ping \
+        wget \
+        psmisc \
+        procps \
+    ; \
+    rm -rf /var/lib/apt/lists/*;
+
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
     \

16.0/fpm/Dockerfile

@@ -1,6 +1,24 @@
 # DO NOT EDIT: created by update.sh from Dockerfile-debian.template
 FROM php:7.3-fpm-stretch
 
+# ##
+# Install standard troubleshooting utils
+# We can't remove apache2 - it brokes build for fpm/apache containers
+# ##
+RUN set -ex; \
+    \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        vim \
+        net-tools \
+        iproute2 \
+        iputils-ping \
+        wget \
+        psmisc \
+        procps \
+    ; \
+    rm -rf /var/lib/apt/lists/*;
+
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
     \

Dockerfile-debian.template

@@ -1,5 +1,23 @@
 FROM php:%%PHP_VERSION%%-%%VARIANT%%-stretch
 
+# ##
+# Install standard troubleshooting utils
+# We can't remove apache2 - it brokes build for fpm/apache containers
+# ##
+RUN set -ex; \
+    \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        vim \
+        net-tools \
+        iproute2 \
+        iputils-ping \
+        wget \
+        psmisc \
+        procps \
+    ; \
+    rm -rf /var/lib/apt/lists/*;
+
 # entrypoint.sh and cron.sh dependencies
 RUN set -ex; \
     \

start_container.sh

@@ -24,7 +24,7 @@ IMAGE="1john2ci/nextcloud:${NAME}-ncd-${TAG}"
 NAME="${NAME}-ncd"
 
 declare -A PUBLISH=(
-[nginx-ncd]=' -p 80:80 '
+[nginx-ncd]=' -p 127.0.0.1:8060:80 '
 [fpm-ncd]=''
 )
 
@@ -57,5 +57,8 @@ eval "CMD='docker run -dit \
     "${IMAGE}" \
     "${EXECCMD}" \
   '"
+export SQLITE_DATABASE='test'
+export NEXTCLOUD_ADMIN_USER='admin'
+export NEXTCLOUD_ADMIN_PASSWORD='admin'
 
 ${CMD}