Set up Travis CI to build example image

.travis.yml

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+dist: trusty
+sudo: required
+language: minimal
+before_install:
+  - "wget 'https://raw.githubusercontent.com/alpinelinux/alpine-chroot-install/v0.6.0/alpine-chroot-install' \
+        && echo 'a827a4ba3d0817e7c88bae17fe34e50204983d1e  alpine-chroot-install' | sha1sum -c || exit 1"
+install:
+  - sudo sh alpine-chroot-install -b v3.6
+before_script:
+  - sudo modprobe nbd
+script:
+  - /alpine/enter-chroot ./alpine-make-vm-image
+        --image-format qcow2
+        --image-size 2G
+        --repositories-file example/repositories
+        --packages "$(cat example/packages)"
+        --script-chroot
+        alpine-virthardened-$(date +%Y-%m-%d).qcow2 -- ./example/configure.sh
+#deploy:
+#  provider: releases
+#  api_key:
+#    secure: <Encrypted GitHub Personal Token>
+#  file: "*.qcow2"
+#  file_glob: true
+#  skip_cleanup: true
+#  on:
+#    tags: true

example/configure.sh

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+#!/bin/sh
+
+_step_counter=0
+step() {
+	_step_counter=$(( _step_counter + 1 ))
+	printf '\n\033[1;36m%d) %s\033[0m\n' $_step_counter "$@" >&2  # bold cyan
+}
+
+
+step 'Set up timezone'
+setup-timezone -z Europe/Prague
+
+step 'Set up networking'
+cat > /etc/network/interfaces <<-EOF
+	iface lo inet loopback
+	iface eth0 inet dhcp
+EOF
+ln -s networking /etc/init.d/net.lo
+ln -s networking /etc/init.d/net.eth0
+
+step 'Adjust rc.conf'
+sed -Ei \
+	-e 's/^[# ](rc_depend_strict)=.*/\1=NO/' \
+	-e 's/^[# ](rc_logger)=.*/\1=YES/' \
+	-e 's/^[# ](unicode)=.*/\1=YES/' \
+	/etc/rc.conf
+
+step 'Enable services'
+rc-update add acpid default
+rc-update add chronyd default
+rc-update add crond default
+rc-update add net.eth0 default
+rc-update add net.lo boot
+rc-update add termencoding boot

example/packages

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+chrony
+less
+logrotate
+openssh
+ssmtp
+sudo

example/repositories

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+https://nl.alpinelinux.org/alpine/v3.6/main
+https://nl.alpinelinux.org/alpine/v3.6/community