[FIX] add apt-transport-https

12.0.Dockerfile

@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libldap2-dev libsasl2-dev python3-dev python3-whee
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             ca-certificates \
             curl \
             fontconfig \

12.0.Dockerfile.arm

@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libldap2-dev libpq-dev libxml2-dev zlib1g-dev libx
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             ca-certificates \
             curl \
             fontconfig \

12.0_ml.Dockerfile

@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libldap2-dev libsasl2-dev python3-dev python3-whee
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             ca-certificates \
             curl \
             fontconfig \

12.0_py3.6.Dockerfile

@@ -9,6 +9,7 @@ ENV APT_DEPS='build-essential libjpeg-dev libldap2-dev libsasl2-dev libpq-dev li
 RUN set -x; \
         apt-get update &&\
         apt-get install -y --no-install-recommends \
+            apt-transport-https \
             curl \
             git \
             gnupg \