Add Alpine variants of postgres, rabbitmq, and redis

postgres/Dockerfile.alpine

@@ -0,0 +1,7 @@
+FROM postgres:alpine
+
+RUN apk add --no-cache bash
+
+COPY docker-healthcheck /usr/local/bin/
+
+HEALTHCHECK CMD ["docker-healthcheck"]

postgres/docker-healthcheck

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eo pipefail
 
-host="$(hostname --ip-address || echo '127.0.0.1')"
+host="$(hostname -i || echo '127.0.0.1')"
 user="${POSTGRES_USER:-postgres}"
 db="${POSTGRES_DB:-$POSTGRES_USER}"
 export PGPASSWORD="${POSTGRES_PASSWORD:-}"

rabbitmq/Dockerfile.alpine

@@ -0,0 +1,7 @@
+FROM rabbitmq:alpine
+
+RUN apk add --no-cache bash
+
+COPY docker-healthcheck /usr/local/bin/
+
+HEALTHCHECK CMD ["docker-healthcheck"]

rabbitmq/docker-healthcheck

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eo pipefail
 
-host="$(hostname --short || echo 'localhost')"
+host="$(hostname -s || echo 'localhost')"
 export RABBITMQ_NODENAME="${RABBITMQ_NODENAME:-"rabbit@$host"}"
 
 if rabbitmqctl status; then

redis/Dockerfile.alpine

@@ -0,0 +1,7 @@
+FROM redis:alpine
+
+RUN apk add --no-cache bash
+
+COPY docker-healthcheck /usr/local/bin/
+
+HEALTHCHECK CMD ["docker-healthcheck"]

redis/docker-healthcheck

@@ -1,7 +1,7 @@
 #!/bin/bash
 set -eo pipefail
 
-host="$(hostname --ip-address || echo '127.0.0.1')"
+host="$(hostname -i || echo '127.0.0.1')"
 
 if ping="$(redis-cli -h "$host" ping)" && [ "$ping" = 'PONG' ]; then
 	exit 0