Move docker files and update travis.yml accordingly

deploy/docker/prod/Dockerfile

@@ -0,0 +1,46 @@
+FROM python:3.6.5-alpine
+
+### Very low chance of changing
+###############################
+# Overridable default config
+ARG APP_USER=atst
+ARG APP_GROUP=atat
+ARG APP_DIR=/opt/atat/atst
+ARG APP_PORT=8000
+ARG SITE_PACKAGES_DIR=/usr/local/lib/python3.6/site-packages
+
+ENV APP_USER "${APP_USER}"
+ENV APP_GROUP "${APP_GROUP}"
+ENV APP_DIR "${APP_DIR}"
+ENV SKIP_PIPENV true
+
+# Set port to open
+EXPOSE "${APP_PORT}"
+
+# Use dumb-init for proper signal handling
+ENTRYPOINT ["/usr/bin/dumb-init", "--"]
+
+# Default command is to launch the server
+CMD ["bash", "-c", "${APP_DIR}/script/server"]
+
+### Items that will change almost every build
+#############################################
+# Copy installed python packages from the tester image
+COPY --from=atst-tester:latest "${SITE_PACKAGES_DIR}" "${SITE_PACKAGES_DIR}"
+
+# Copy the app directory contents from the tester image (includes node modules)
+COPY --from=atst-tester:latest "${APP_DIR}" "${APP_DIR}"
+
+# Set working dir
+WORKDIR ${APP_DIR}
+
+# Add required system packages and app user
+RUN set -x ; \
+  script/alpine_setup "${APP_USER}" "${APP_GROUP}"
+
+# Update file ownership
+RUN set -x ; \
+  for subdir in $(find . -type d -maxdepth 1 | grep -Ee '.[^/]' | grep -Fve 'node_modules'); do chown atst:atat -R ${subdir}; done
+
+# Run as the unprivileged APP user
+USER "${APP_USER}"