FIX locale

Not sure what changed, but the locale is not problem generated in the
base image anymore. Also, pg-15.3 image has been removed from
DockerHub's README for postgres, so let's move to 15.4.

Dockerfile

@@ -1,8 +1,9 @@
-FROM postgres:15.3
+FROM postgres:15.4
 MAINTAINER Olivier El Mekki <olivier@el-mekki.com>
 
 RUN apt update && apt install -y build-essential curl postgresql-server-dev-15
-RUN curl https://ftp.postgresql.org/pub/source/v15.3/postgresql-15.3.tar.bz2 -o /postgresql-15.3.tar.bz2
-RUN cd / && tar xvf postgresql-15.3.tar.bz2
-RUN cd /postgresql-15.3/contrib/cube && sed -i 's/#define CUBE_MAX_DIM (100)/#define CUBE_MAX_DIM (350)/' cubedata.h && \
+RUN curl https://ftp.postgresql.org/pub/source/v15.4/postgresql-15.4.tar.bz2 -o /postgresql-15.4.tar.bz2
+RUN cd / && tar xvf postgresql-15.4.tar.bz2
+RUN cd /postgresql-15.4/contrib/cube && sed -i 's/#define CUBE_MAX_DIM (100)/#define CUBE_MAX_DIM (350)/' cubedata.h && \
     USE_PGXS=true make && USE_PGXS=true make install
+RUN echo -e "\nen_US.UTF-8 UTF-8" > /etc/locale.gen && locale-gen