emulator: Bump included postgresql version to 18

doc/developer/guide.md

@@ -93,7 +93,7 @@ all set.
 
 If you are just testing Materialize locally and don't care about data loss you can run environmentd with `eatmydata environmentd`, which will disable fsync calls.
 
-Similarly postgres as the metadata store can be instructed to eat your data using `echo LD_PRELOAD=libeatmydata.so > /etc/postgresql/17/main/environment`, and then restarting it.
+Similarly postgres as the metadata store can be instructed to eat your data using `echo LD_PRELOAD=libeatmydata.so > /etc/postgresql/18/main/environment`, and then restarting it.
 
 On my Linux system without `eatmydata` for both Materialize and Postgres, running with `bin/environmentd --reset --optimized --no-default-features --postgres=postgres://deen@%2Fvar%2Frun%2Fpostgresql`:
 ```

misc/images/materialized-base/postgresql.conf

@@ -10,7 +10,7 @@
 data_directory = '/mzdata/postgres'
 hba_file = '/etc/postgresql/pg_hba.conf'
 ident_file = '/mzdata/postgres/pg_ident.conf'
-external_pid_file = '/var/run/postgresql/17-main.pid'
+external_pid_file = '/var/run/postgresql/18-main.pid'
 listen_addresses = '*'
 port = 26257
 max_connections = 5000
@@ -22,7 +22,7 @@ max_wal_size = 1GB
 min_wal_size = 80MB
 log_line_prefix = '%m [%p] %q%u@%d '
 log_timezone = UTC
-cluster_name = '17/main'
+cluster_name = '18/main'
 datestyle = 'iso, mdy'
 timezone = UTC
 lc_messages = 'C.UTF-8'

src/materialized/ci/Dockerfile

@@ -18,6 +18,6 @@ RUN ln -s /usr/local/bin/materialized /usr/local/bin/environmentd \
 
 USER materialize
 
-RUN /usr/lib/postgresql/17/bin/initdb -D /mzdata/postgres -U root --auth-local=trust
+RUN /usr/lib/postgresql/18/bin/initdb -D /mzdata/postgres -U root --auth-local=trust
 
 ENTRYPOINT ["tini", "--", "entrypoint.sh"]

src/materialized/ci/entrypoint.sh

@@ -63,20 +63,20 @@ if ! is_truthy "${MZ_NO_BUILTIN_POSTGRES:-0}"; then
   # Should exist already, but /mzdata might be overwritten with a fresh volume
   if [ ! -f $PGDATA/PG_VERSION ]; then
     mkdir -p $PGDATA
-    /usr/lib/postgresql/17/bin/initdb -D $PGDATA -U $PGUSER --auth-local=trust
+    /usr/lib/postgresql/18/bin/initdb -D $PGDATA -U $PGUSER --auth-local=trust
   fi
 
   # Might have been killed hard
   rm -f $PGDATA/postmaster.pid
-  /usr/lib/postgresql/17/bin/postgres -D $PGDATA \
+  /usr/lib/postgresql/18/bin/postgres -D $PGDATA \
       -c listen_addresses='*' \
       -c unix_socket_directories=/var/run/postgresql \
       -c config_file=/etc/postgresql/postgresql.conf > /mzdata/postgres/postgres.log 2>&1 &
   PGPID=$!
 
   trap 'kill -INT $PGPID; wait $PGPID' SIGTERM SIGINT
 
-  until /usr/lib/postgresql/17/bin/pg_isready > /dev/null 2>&1; do
+  until /usr/lib/postgresql/18/bin/pg_isready > /dev/null 2>&1; do
     sleep 0.01
   done