squirrel-sql: Add MSSQL driver. (#55626)

pkgs/servers/sql/mssql/jdbc/builder.sh

@@ -0,0 +1,6 @@
+source $stdenv/setup
+
+set -e
+
+mkdir -p $out/share/java
+cp $src $out/share/java/mssql-jdbc.jar

pkgs/servers/sql/mssql/jdbc/default.nix

@@ -0,0 +1,16 @@
+{stdenv, fetchurl}:
+
+stdenv.mkDerivation rec {
+  pname = "mssql-jdbc";
+  version = "7.2.2";
+  builder = ./builder.sh;
+
+  src = fetchurl {
+    url = "https://github.com/Microsoft/mssql-jdbc/releases/download/v${version}/${pname}-${version}.jre8.jar";
+    sha256 = "09psxjy1v3khq8lcq6h9mbgyijsgawf0z2qryk1l91ypnwl8s3pg";
+  };
+
+  meta = {
+    platforms = stdenv.lib.platforms.unix;
+  };
+}