fix: upgrade pg_textsearch from v0.2.0 to main@ae1c221 (crash fix)

Upgrades pg_textsearch to include the ResourceOwnerEnlarge crash fix
from PR #248 (issue #247). The crash occurs when a BM25 index scan
runs inside a transaction that is rolled back.

Changes:
- Pin pg_textsearch to commit ae1c221 on main (no tagged release
  includes the fix yet; latest release is v0.5.1)
- Remove the math.h sed workaround (fixed upstream in v0.3.0)
- Clone full repo instead of shallow tag clone (needed for commit checkout)

Author: pyramation

Dockerfile

@@ -4,7 +4,9 @@
 ARG PG_VERSION=17
 ARG PGVECTOR_VERSION=0.8.0
 ARG POSTGIS_VERSION=3.5.1
-ARG PG_TEXTSEARCH_VERSION=0.2.0
+# Pin to main branch commit that includes the ResourceOwnerEnlarge crash fix (PR #248)
+# No tagged release includes this fix yet (latest release is v0.5.1)
+ARG PG_TEXTSEARCH_COMMIT=ae1c221
 ARG PGSODIUM_VERSION=3.1.9
 
 #############################################
@@ -14,7 +16,7 @@ FROM postgres:${PG_VERSION}-alpine AS builder
 
 ARG PGVECTOR_VERSION
 ARG POSTGIS_VERSION
-ARG PG_TEXTSEARCH_VERSION
+ARG PG_TEXTSEARCH_COMMIT
 ARG PGSODIUM_VERSION
 
 RUN apk add --no-cache \
@@ -57,10 +59,12 @@ RUN curl -L https://download.osgeo.org/postgis/source/postgis-${POSTGIS_VERSION}
     make install
 
 # pg_textsearch (BM25)
-RUN git clone --branch v${PG_TEXTSEARCH_VERSION} --depth 1 https://github.com/timescale/pg_textsearch.git && \
+# Build from main at a specific commit to include the temp-table/transaction
+# crash fix (PR #248, issue #247: ResourceOwnerEnlarge on rollback).
+# The math.h workaround is no longer needed (fixed upstream in v0.3.0).
+RUN git clone https://github.com/timescale/pg_textsearch.git && \
     cd pg_textsearch && \
-    # Fix missing math.h include (upstream bug)
-    sed -i '1i #include <math.h>' src/am/build.c && \
+    git checkout ${PG_TEXTSEARCH_COMMIT} && \
     make -j$(nproc) && \
     make install