fix: pin plpgsql_check to v2.8.5 and use pglinter rule_messages

Author: psteinroe

Dockerfile

@@ -4,8 +4,9 @@ FROM postgres:15
 RUN apt-get update && \
     apt-get install -y postgresql-server-dev-15 gcc make git curl pkg-config libssl-dev libclang-dev clang && \
     # Install plpgsql_check (C extension - simple make install)
+    # Pin to v2.8.5 for stability with PG15
     cd /tmp && \
-    git clone https://github.com/okbob/plpgsql_check.git && \
+    git clone --branch v2.8.5 --depth 1 https://github.com/okbob/plpgsql_check.git && \
     cd plpgsql_check && \
     make && \
     make install && \
@@ -18,7 +19,7 @@ RUN apt-get update && \
     cargo install cargo-pgrx --version 0.16.1 --locked && \
     # Initialize pgrx for PostgreSQL 15
     cargo pgrx init --pg15 $(which pg_config) && \
-    # Clone and build pglinter (using feat/83/violation_list branch for get_violations API)
+    # Clone and build pglinter (using feat/83/violation_list branch for get_violations API + rule_messages)
     cd /tmp && \
     git clone -b feat/83/violation_list https://github.com/pmpetit/pglinter.git && \
     cd pglinter && \