Adds env var to set certbot acme server

this is required for test suite to use dns certbot request
without talking to live or staging letsencrypt servers or
production level dns providers. This is a backwards port
from the v3 branch and opens the door for a full certificate
cypress test

docker/dev/Dockerfile

@@ -1,7 +1,10 @@
+FROM nginxproxymanager/testca AS testca
+FROM letsencrypt/pebble AS pebbleca
 FROM nginxproxymanager/nginx-full:certbot-node
 LABEL maintainer="Jamie Curnow <jc@jc21.com>"
 
-# See: https://github.com/just-containers/s6-overlay/blob/master/README.md
+SHELL ["/bin/bash", "-o", "pipefail", "-c"]
+
 ENV SUPPRESS_NO_CONFIG_WARNING=1 \
 	S6_BEHAVIOUR_IF_STAGE2_FAILS=1 \
 	S6_CMD_WAIT_FOR_SERVICES_MAXTIME=0 \
@@ -17,17 +20,20 @@ RUN echo "fs.file-max = 65535" > /etc/sysctl.conf \
 	&& rm -rf /var/lib/apt/lists/*
 
 # Task
-RUN cd /usr \
-	&& curl -sL https://taskfile.dev/install.sh | sh \
-	&& cd /root
+WORKDIR /usr
+RUN curl -sL https://taskfile.dev/install.sh | sh
+WORKDIR /root
 
 COPY rootfs /
-RUN rm -f /etc/nginx/conf.d/production.conf
-RUN chmod 644 /etc/logrotate.d/nginx-proxy-manager
-
-# s6 overlay
 COPY scripts/install-s6 /tmp/install-s6
-RUN /tmp/install-s6 "${TARGETPLATFORM}" && rm -f /tmp/install-s6
+RUN rm -f /etc/nginx/conf.d/production.conf \
+	&& chmod 644 /etc/logrotate.d/nginx-proxy-manager \
+	&& /tmp/install-s6 "${TARGETPLATFORM}" \
+	&& rm -f /tmp/install-s6
+
+# Certs for testing purposes
+COPY --from=pebbleca /test/certs/pebble.minica.pem /etc/ssl/certs/pebble.minica.pem
+COPY --from=testca /home/step/certs/root_ca.crt /etc/ssl/certs/NginxProxyManager.crt
 
 EXPOSE 80 81 443
 ENTRYPOINT [ "/init" ]