chore(build): pin Rust toolchain to 1.87.0 and bump pgrx to 0.16.1

Author: teyfix

timescaledb-pgrx/Dockerfile

@@ -1,5 +1,12 @@
 FROM timescale/timescaledb-ha:pg17 AS pgrx
 
+# Current pgrx version is 0.16.1 at 2026/01/09
+# see: https://github.com/supabase/wrappers/commit/eea6f87f
+ARG PGRX_VER="0.16.1"
+
+# Current Rust version is 1.87.0 at 2025/06/12
+ARG RUST_VER="1.87.0"
+
 USER root
 
 RUN \
@@ -36,16 +43,12 @@ ENV PATH="/home/pgrx/.cargo/bin:${PATH}"
 ENV PG17_PG_CONFIG="/usr/lib/postgresql/17/bin/pg_config"
 
 # Install Rust
-# Current Rust version is 1.87.0 at 2025/06/12
-# --default-toolchain 1.87.0
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain "${RUST_VER}"
 
 FROM pgrx AS pgrx-wrappers
 
 # Install and initialize pgrx
-# Current pgrx version should be 0.14.3 at 2025/06/12
-# --version 0.14.3
-RUN cargo install --locked --version=0.14.3 cargo-pgrx
+RUN cargo install --locked --version "${PGRX_VER}" cargo-pgrx
 RUN cargo pgrx init --pg17=${PG17_PG_CONFIG}