try to install certbot to ease https certificate generation

Dockerfile

@@ -10,7 +10,13 @@ WORKDIR ${APP_SOURCE}
 
 RUN apt-get update -qq -y && \
     apt-get upgrade -qq -y && \
-    apt-get install -qq -y git
+    apt-get install -qq -y git 
+
+# CERTBOT installation
+RUN apt-get install -qq -y snapd && \
+    apt-get remove certbot && \
+    snap install --classic certbot && \
+    ln -s /snap/bin/certbot /usr/bin/certbot
 
 COPY . ${APP_SOURCE}