Build plperl, plpython and pltcl in alpine images

Author: wolfgangwalther

10/alpine/Dockerfile

@@ -55,10 +55,9 @@ RUN set -eux; \
 		perl-utils \
 # configure: error: Perl module IPC::Run is required to run TAP tests
 		perl-ipc-run \
-#		perl-dev \
-#		python-dev \
-#		python3-dev \
-#		tcl-dev \
+		perl-dev \
+		python3-dev \
+		tcl-dev \
 		util-linux-dev \
 		zlib-dev \
 {{ if .major >= 10 then ( -}}
@@ -100,14 +99,12 @@ RUN set -eux; \
 		--prefix=/usr/local \
 		--with-includes=/usr/local/include \
 		--with-libraries=/usr/local/lib \
-		\
-# these make our image abnormally large (at least 100MB larger), which seems uncouth for an "Alpine" (ie, "small") variant :)
 #		--with-krb5 \
 #		--with-gssapi \
 #		--with-ldap \
-#		--with-tcl \
-#		--with-perl \
-#		--with-python \
+		--with-tcl \
+		--with-perl \
+		--with-python \
 #		--with-pam \
 		--with-openssl \
 		--with-libxml \
@@ -131,6 +128,9 @@ RUN set -eux; \
 			| tr ',' '\n' \
 			| sort -u \
 			| awk 'system("[ -e /usr/local/lib/" $1 " ]") == 0 { next } { print "so:" $1 }' \
+# Remove plperl, plpython and pltcl dependencies by default to save image size
+# To use the pl extensions, those have to be installed in a derived image
+			| grep -v -e perl -e python -e tcl \
 	)"; \
 	apk add --no-cache --virtual .postgresql-rundeps \
 		$runDeps \