Add convenience aliases to Docker image

Note that you will need to run a login shell so /etc/profile is loaded.
If you are starting the image directly, use:

    docker run -it --rm sshkit-test-sshd /bin/sh -l

The "-l" flag will make `sh` behave like a login shell.

Author: pmeinhardt

test/support/docker/Dockerfile

@@ -1,38 +1,38 @@
 FROM alpine:3.7
 
 # Set up an Alpine Linux machine running an SSH server.
-# Autogenerate missing host keys.
-
 RUN apk add --update --no-cache openssh sudo
+
+# Autogenerate missing host keys.
 RUN ssh-keygen -A
 
 # Create the skeleton directory, used for creating new users.
-
 RUN mkdir -p /etc/skel/.ssh
 RUN chmod 700 /etc/skel/.ssh
-
 RUN touch /etc/skel/.ssh/authorized_keys
 RUN chmod 600 /etc/skel/.ssh/authorized_keys
 
 # Allow members of group "wheel" to execute any command.
-
 RUN echo "%wheel ALL=(ALL) ALL" >> /etc/sudoers.d/wheel
 
 # Allow passwordless sudo for users in the "passwordless-sudoers" group.
 # Users in this group may run commands as any user in any group.
-
 RUN addgroup -S passwordless-sudoers
 RUN echo "%passwordless-sudoers ALL=(ALL:ALL) NOPASSWD: ALL" >> /etc/sudoers.d/yolo
 
-# Add fixture data for tests
+# Add configuration for a better developer experience.
+COPY etc/profile.d/* /etc/profile.d
+
+# Add fixture data for tests.
 COPY fixtures /fixtures
 
-# Set up a subsystem
+# Set up a subsystem.
 RUN echo "Subsystem greeting-subsystem echo Hello, who am I talking to?; while :; do read varname; echo It\'s nice to meet you \$varname; done" >> /etc/ssh/sshd_config
 
-# Run SSH daemon and expose the standard SSH port.
+# Expose the standard SSH port.
 EXPOSE 22
 
+# Run SSH daemon.
 CMD ["/usr/sbin/sshd", "-D", "-e"]
 
 # For debugging, let sshd be more verbose:

test/support/docker/etc/profile.d/aliases.sh

@@ -0,0 +1,3 @@
+alias la='ls -1A'
+alias ll='ls -al'
+alias l='ls -1'