Merge pull request #57 from azavea/feature/jrb/fix-keyserver-issues

Fallback to IPv4 pool to fix keyserver receive failed

Author: rbreslow

Dockerfile-slim.template

@@ -18,7 +18,8 @@ RUN set -ex; \
 # uid                  PostgreSQL Debian Repository
 	key='B97B0AFCAA1A47F044F244A07FCC7D46ACCC4CF8'; \
 	export GNUPGHOME="$(mktemp -d)"; \
-	gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key"; \
+	(gpg --keyserver ha.pool.sks-keyservers.net --recv-keys "$key" \
+	    || gpg --keyserver ipv4.pool.sks-keyservers.net --recv-keys "$key"); \
 	gpg --export "$key" > /etc/apt/trusted.gpg.d/postgres.gpg; \
 	rm -rf "$GNUPGHOME"; \
 	apt-key list