Restructured docker building

I have restructured the docker build process entirely, the binary gets
built outside of the docker build command, now we are managing all
dependencies with real Alpine packages and I have dropped features like
socat or the cron daemon.

Signed-off-by: Thomas Boerger <tboerger@suse.de>

docker/etc/nsswitch.conf

@@ -0,0 +1,15 @@
+# /etc/nsswitch.conf
+
+passwd:         compat
+group:          compat
+shadow:         compat
+
+hosts:          files dns
+networks:       files
+
+protocols:      db files
+services:       db files
+ethers:         db files
+rpc:            db files
+
+netgroup:       nis

docker/etc/profile.d/gitea.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+export GITEA_CUSTOM=/data/gitea

docker/etc/s6/.s6-svscan/finish

@@ -0,0 +1,2 @@
+#!/bin/bash
+exit 0

docker/etc/s6/gitea/finish

@@ -0,0 +1,2 @@
+#!/bin/bash
+exit 0

docker/etc/s6/gitea/run

@@ -0,0 +1,6 @@
+#!/bin/bash
+[[ -f ./setup ]] && source ./setup
+
+pushd /app/gitea > /dev/null
+    exec gosu git /app/gitea/gitea web
+popd

docker/etc/s6/gitea/setup

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+if [ ! -d /data/git/.ssh ]; then
+    mkdir -p /data/git/.ssh
+    chmod 700 /data/git/.ssh
+fi
+
+if [ ! -f /data/git/.ssh/environment ]; then
+    echo "GITEA_CUSTOM=/data/gitea" >| /data/git/.ssh/environment
+    chmod 600 /data/git/.ssh/environment
+fi
+
+if [ ! -f /data/gitea/conf/app.ini ]; then
+    mkdir -p /data/gitea/conf
+    cp /etc/templates/app.ini /data/gitea/conf/app.ini
+fi
+
+chown -R git:git /data/gitea /app/gitea /data/git
+chmod 0755 /data/gitea /app/gitea /data/git

docker/etc/s6/openssh/finish

@@ -0,0 +1,2 @@
+#!/bin/bash
+exit 0

docker/etc/s6/openssh/run

@@ -0,0 +1,6 @@
+#!/bin/bash
+[[ -f ./setup ]] && source ./setup
+
+pushd /root > /dev/null
+    exec gosu root /usr/sbin/sshd -E /var/log/sshd.log -D
+popd

docker/etc/s6/openssh/setup

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+if [ ! -d /data/ssh ]; then
+    mkdir -p /data/ssh
+fi
+
+if [ ! -f /data/ssh/ssh_host_ed25519_key ]; then
+    echo "Generating /data/ssh/ssh_host_ed25519_key..."
+    ssh-keygen -t ed25519 -b 4096 -f /data/ssh/ssh_host_ed25519_key -N "" > /dev/null
+fi
+
+if [ ! -f /data/ssh/ssh_host_rsa_key ]; then
+    echo "Generating /data/ssh/ssh_host_rsa_key..."
+    ssh-keygen -t rsa -b 2048 -f /data/ssh/ssh_host_rsa_key -N "" > /dev/null
+fi
+
+if [ ! -f /data/ssh/ssh_host_dsa_key ]; then
+    echo "Generating /data/ssh/ssh_host_dsa_key..."
+    ssh-keygen -t dsa -f /data/ssh/ssh_host_dsa_key -N "" > /dev/null
+fi
+
+if [ ! -f /data/ssh/ssh_host_ecdsa_key ]; then
+    echo "Generating /data/ssh/ssh_host_ecdsa_key..."
+    ssh-keygen -t ecdsa -b 256 -f /data/ssh/ssh_host_ecdsa_key -N "" > /dev/null
+fi
+
+chown root:root /data/ssh/*
+chmod 0700 /data/ssh
+chmod 0600 /data/ssh/*

docker/etc/s6/syslogd/finish

@@ -0,0 +1,2 @@
+#!/bin/bash
+exit 0

docker/etc/s6/syslogd/run

@@ -0,0 +1,6 @@
+#!/bin/bash
+[[ -f ./setup ]] && source ./setup
+
+pushd /root > /dev/null
+    exec gosu root /sbin/syslogd -nS -O-
+popd

docker/etc/s6/syslogd/setup

@@ -0,0 +1 @@
+#!/bin/bash

docker/etc/ssh/sshd_config

@@ -0,0 +1,33 @@
+Port 22
+Protocol 2
+
+AddressFamily any
+ListenAddress 0.0.0.0
+ListenAddress ::
+
+LogLevel INFO
+
+HostKey /data/ssh/ssh_host_ed25519_key
+HostKey /data/ssh/ssh_host_rsa_key
+HostKey /data/ssh/ssh_host_dsa_key
+HostKey /data/ssh/ssh_host_ecdsa_key
+
+AuthorizedKeysFile .ssh/authorized_keys
+
+UseDNS no
+AllowAgentForwarding no
+AllowTcpForwarding no
+PrintMotd no
+PrintLastLog no
+
+PermitUserEnvironment yes
+PermitRootLogin no
+ChallengeResponseAuthentication no
+PasswordAuthentication no
+PermitEmptyPasswords no
+
+AllowUsers git
+
+Banner none
+Subsystem sftp /usr/lib/ssh/sftp-server
+UsePrivilegeSeparation no

docker/etc/templates/app.ini

@@ -0,0 +1,24 @@
+[repository]
+ROOT = /data/git/repositories
+
+[repository.upload]
+TEMP_PATH = /data/gitea/uploads
+
+[server]
+APP_DATA_PATH = /data/gitea
+
+[database]
+HOST = mysql:3306
+PATH = /data/gitea/gitea.db
+
+[session]
+PROVIDER_CONFIG = /data/gitea/sessions
+
+[picture]
+AVATAR_UPLOAD_PATH = /data/gitea/avatars
+
+[attachment]
+PATH = /data/gitea/attachments
+
+[log]
+ROOT_PATH = /data/gitea/log