Fix curl SSL failure

Add ca-certificates to the initial apt-get install so curl can verify
HTTPS connections when fetching GPG keys for the Adoptium and MongoDB
repos. Without it curl exits with code 77 (certificate file error).

Remove the outdated openjdk-8/7 comment in Dockerfile

Author: jacobalberty

Dockerfile

@@ -56,7 +56,6 @@ RUN chmod +x /usr/local/bin/docker-entrypoint.sh \
  && chmod +x /usr/local/bin/docker-build.sh \
  && chmod -R +x /usr/local/docker/pre_build
 
-# Push installing openjdk-8-jre first, so that the unifi package doesn't pull in openjdk-7-jre as a dependency? Else uncomment and just go with openjdk-7.
 RUN set -ex \
  && mkdir -p /usr/share/man/man1/ \
  && groupadd -r unifi -g $UNIFI_GID \

docker-build.sh

@@ -36,6 +36,7 @@ fi
 apt-get update
 apt-get install -qy --no-install-recommends \
     apt-transport-https \
+    ca-certificates \
     curl \
     dirmngr \
     gpg \