Highlight uncommitted changes in version

If there are uncommitted changes in the app repository when building,
then append `_uncommitted_<random>` to it to distinguish the image
from one built from a clean checkout.

Also change the version used when renaming a container on redeploy to
distinguish and explain the version suffixes.

test/integration/docker/deployer/Dockerfile

@@ -23,7 +23,6 @@ RUN mkdir -p /etc/docker/certs.d/registry:4443 && ln -s /shared/certs/domain.crt
 RUN git config --global user.email "deployer@example.com"
 RUN git config --global user.name "Deployer"
 RUN git init && git add . && git commit -am "Initial version"
-RUN git rev-parse HEAD > version
 
 HEALTHCHECK --interval=1s CMD pgrep sleep
 

test/integration/docker/deployer/app/Dockerfile

@@ -1,4 +1,7 @@
 FROM nginx:1-alpine-slim
 
 COPY default.conf /etc/nginx/conf.d/default.conf
-COPY version /usr/share/nginx/html/version
+
+ARG COMMIT_SHA
+RUN echo $COMMIT_SHA > /usr/share/nginx/html/version
+

test/integration/docker/deployer/app/config/deploy.yml

@@ -9,6 +9,8 @@ registry:
   password: root
 builder:
   multiarch: false
+  args:
+    COMMIT_SHA: <%= `git rev-parse HEAD` %>
 healthcheck:
   cmd: wget -qO- http://localhost > /dev/null
 traefik:

test/integration/docker/deployer/update_app_rev.sh

@@ -1,4 +1,3 @@
 #!/bin/bash
 
 git commit -am 'Update rev' --amend
-git rev-parse HEAD > version