Remove debugging echo statement from Dockerfiles

docker/Dockerfile.j2

@@ -43,8 +43,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/aarch64/mysql/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/aarch64/sqlite/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/amd64/mysql/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/amd64/postgresql/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/amd64/sqlite/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/armv6/mysql/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/armv6/sqlite/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/armv7/mysql/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \

docker/armv7/sqlite/Dockerfile

@@ -14,8 +14,6 @@ ARG LANG=C.UTF-8
 ARG TZ=UTC
 ARG TERM=xterm-256color
 
-RUN echo $TERM
-
 RUN apt-get update \
     && apt-get install -y \
         --no-install-recommends \