chore: build pgvector from source

Author: gabrieljablonski

Dockerfile

@@ -1,6 +1,27 @@
-FROM pgvector/pgvector:pg16 AS builder
-
 FROM postgres:16-alpine
 
-COPY --from=builder /usr/lib/postgresql/16/lib/vector.so /usr/lib/postgresql/16/lib/vector.so
-COPY --from=builder /usr/share/postgresql/16/extension/vector* /usr/lib/postgresql/16/share/extension/
+RUN apk update && apk add --no-cache \
+    build-base \
+    git \
+    postgresql-dev \
+    clang20 \
+    llvm20-dev \
+    llvm20-libs \
+    llvm20-linker-tools
+
+RUN ln -s "$(which clang)"   /usr/bin/clang-19 \
+ && ln -s "$(which clang++)" /usr/bin/clang++-19 \
+ && mkdir -p /usr/lib/llvm19/bin \
+ && ln -s /usr/bin/llvm-lto /usr/lib/llvm19/bin/llvm-lto
+
+ENV CC=clang
+
+RUN git clone --depth 1 https://github.com/pgvector/pgvector.git \
+ && cd pgvector \
+ && make \
+ && make install \
+ && cd .. \
+ && rm -rf pgvector
+
+COPY docker-entrypoint-initdb.d/01-create-vector.sh /docker-entrypoint-initdb.d/
+RUN chmod +x /docker-entrypoint-initdb.d/01-create-vector.sh

docker-entrypoint-initdb.d/01-create-vector.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -e
+
+# create the extension in the default DB (usually $POSTGRES_DB or 'postgres')
+psql --username "$POSTGRES_USER" <<-EOSQL
+  CREATE EXTENSION IF NOT EXISTS vector WITH SCHEMA public;
+EOSQL
+
+# also install into template1 so any newly created database inherits it
+psql --username "$POSTGRES_USER" --dbname=template1 <<-EOSQL
+  CREATE EXTENSION IF NOT EXISTS vector;
+EOSQL