Wait for healthy containers in integration test

Rather than waiting 5 seconds and hoping for the best after we boot
docker compose, add docker healthchecks and wait for all the containers
to be healthy.

test/integration/docker/deployer/Dockerfile

@@ -24,4 +24,6 @@ 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"
 
+HEALTHCHECK --interval=1s CMD pgrep sleep
+
 CMD ["./boot.sh"]

test/integration/docker/load_balancer/Dockerfile

@@ -2,3 +2,4 @@ FROM nginx:1-alpine-slim
 
 COPY default.conf /etc/nginx/conf.d/default.conf
 
+HEALTHCHECK --interval=1s CMD pgrep nginx

test/integration/docker/registry/Dockerfile

@@ -4,4 +4,6 @@ COPY boot.sh .
 
 RUN ln -s /shared/certs /certs
 
+HEALTHCHECK --interval=1s CMD pgrep registry
+
 ENTRYPOINT ["./boot.sh"]

test/integration/docker/shared/Dockerfile

@@ -8,7 +8,10 @@ RUN mkdir ssh && \
   ssh-keygen -t rsa -f ssh/id_rsa -N ""
 
 COPY registry-dns.conf .
+COPY boot.sh .
 
 RUN mkdir certs && openssl req -newkey rsa:4096 -nodes -sha256 -keyout certs/domain.key   -x509 -days 365 -out certs/domain.crt   -subj '/CN=registry' -extensions EXT -config registry-dns.conf
 
-CMD ["bash", "-c", "cp -r * /shared"]
+HEALTHCHECK --interval=1s CMD pgrep sleep
+
+CMD ["./boot.sh"]

test/integration/docker/shared/boot.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+cp -r * /shared
+
+trap "pkill -f sleep" term
+
+sleep infinity & wait

test/integration/docker/vm/Dockerfile

@@ -9,4 +9,6 @@ RUN mkdir -p /etc/docker/certs.d/registry:4443 && ln -s /shared/certs/domain.crt
 
 COPY boot.sh .
 
+HEALTHCHECK --interval=1s CMD pgrep dockerd
+
 CMD ["./boot.sh"]