added build script

build.py

@@ -0,0 +1,38 @@
+#! /usr/bin/env python3
+
+import argparse
+import re
+import sys
+from subprocess import call
+
+def main():
+    parser = argparse.ArgumentParser(description='Build postgresql in docker')
+    parser.add_argument('--pg-version', dest='pg_version', default='9.6.3', help='Postgres version to build')
+    parser.add_argument('--docker-tag', dest='docker_tag', default='postgres-custom', help='Docker tag to apply to the image. The version will be automatically added.')
+
+    args = parser.parse_args()
+
+    pg_version = args.pg_version
+    docker_tag = args.docker_tag
+
+    if not re.match('^[0-9]+\.[0-9]+\.[0-9]+', pg_version):
+        print("Bad version format. Should be major.minor.fix (eg: 9.6.3)")
+        sys.exit(64)
+
+    pg_version_ = pg_version.replace('.', '_')
+    split = pg_version.split('.')
+    pg_major = split[0] + '.' + split[1]
+    docker_tag_full = '%s:%s' % (docker_tag, pg_version)
+
+    print('Building postgres:\nPG_MAJOR=%s\nPG_VERSION=%s\nPG_VERSION_=%s\nDocker tag: %s' %
+            (pg_major, pg_version, pg_version_, docker_tag_full))
+
+    call(['docker', 'build',
+        '-t', docker_tag_full,
+        '--build-arg', 'PG_MAJOR=%s' % pg_major,
+        '--build-arg', 'PG_VERSION=%s' % pg_version,
+        '--build-arg', 'PG_VERSION_=%s' % pg_version_,
+        '.'])
+
+if __name__ == '__main__':
+    main()