Add custom container image builds [skip ci]

postgres/Dockerfile

@@ -0,0 +1,21 @@
+ARG PG_VERSION=18
+FROM postgres:${PG_VERSION}
+
+ARG PG_VERSION=18
+ARG POSTGIS_VERSION=3
+ARG VCHORD_VERSION=0.5.3
+
+RUN set -eux; \
+    apt-get update; \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+        ca-certificates \
+        wget \
+        postgresql-${PG_VERSION}-cron \
+        postgresql-${PG_VERSION}-pgvector \
+        postgresql-${PG_VERSION}-postgis-${POSTGIS_VERSION}; \
+    wget -O /tmp/vchord.deb "https://github.com/tensorchord/VectorChord/releases/download/${VCHORD_VERSION}/postgresql-${PG_VERSION}-vchord_${VCHORD_VERSION}-1_amd64.deb"; \
+    DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends /tmp/vchord.deb; \
+    rm -f /tmp/vchord.deb; \
+    rm -rf /var/lib/apt/lists/*
+
+CMD ["postgres", "-c", "shared_preload_libraries=pg_cron,vchord", "-c", "cron.database_name=firecrawl"]