databases/postgresql-promscale: add new port

The PostgreSQL Promscale extension provides the required database capability
and PL/pgsql code to support Promscale 0.11.0+

Promscale is API-compatible with Prometheus and stores your metrics in PostgreSQL
in a highly performant storage format with the help of TimescaleDB.

databases/Makefile

@@ -669,6 +669,7 @@
     SUBDIR += postgresql-plproxy
     SUBDIR += postgresql-plv8js
     SUBDIR += postgresql-prefix
+    SUBDIR += postgresql-promscale
     SUBDIR += postgresql-relay
     SUBDIR += postgresql-repmgr
     SUBDIR += postgresql-rum

databases/postgresql-promscale/Makefile

@@ -0,0 +1,50 @@
+PORTNAME=	promscale
+PORTVERSION=	0.7.0
+PORTREVISION=	0
+CATEGORIES=	databases
+PKGNAMEPREFIX=	postgresql${PGSQL_VER:S/.//}-
+
+MAINTAINER=	feld@FreeBSD.org
+COMMENT=	Tables, types and functions supporting Promscale
+WWW=		https://www.timescale.com/promscale
+
+LICENSE=	PostgreSQL
+
+# Depends on an unpublished crate. Can't use cargo.mk to fetch it.
+PGX_REV=	96ece243
+DISTFILES+=	pgx-${PGX_REV}.tar.gz
+SITES.pgx-${PGX_REV}.tar.gz+=	${MASTER_SITE_GITHUB:=timescale/}pgx/archive/${PGX_REV}.tar.gz
+
+USES=		cargo gmake pgsql:12+
+
+BUILD_DEPENDS=	bash>0:shells/bash
+
+RUN_DEPENDS=	timescaledb>0:databases/timescaledb
+
+USE_GITHUB=	yes
+GH_ACCOUNT=	timescale timescale:pgx
+GH_PROJECT=	promscale_extension pgx:pgx
+GH_TAGNAME=	${PORTVERSION} 96ece243:pgx
+
+WANT_PGSQL=	server
+
+MAKE_ARGS+=	PG_CONFIG=${LOCALBASE}/bin/pg_config
+MAKE_ENV+=	MAKE=gmake PATH=${PATH}:${WRKDIR}/.cargo/bin
+
+.include "${.CURDIR}/crates.mk"
+
+post-extract:
+	mv ${WRKDIR}/pgx-* ${WRKDIR}/pgx
+
+pre-build:
+	cd ${WRKSRC} && ${SETENV} ${MAKE_ENV} cargo install --offline --path ../pgx/cargo-pgx cargo-pgx
+	mkdir -p ${WRKDIR}/.pgx
+	${PRINTF} '[configs]\npg${PGSQL_VERSION}="${LOCALBASE}/bin/pg_config"\n' > ${WRKDIR}/.pgx/config.toml
+
+do-build:
+	cd ${WRKSRC} && ${SETENV} ${MAKE_ENV} ${MAKE_CMD} package
+
+do-install:
+	cd ${WRKSRC}/target/release/promscale-pg${PGSQL_VER} && ${PAX} -rw . ${STAGEDIR}
+
+.include <bsd.port.mk>