Add alpine-based Docker image (#318)

Closes #312

.goreleaser.yml

@@ -72,12 +72,24 @@ scoop:
     email: [email protected]
 
 dockers:
-  - image_templates:
+  - dockerfile: Dockerfile
+    binaries:
+      - oathkeeper
+    image_templates:
       - "oryd/oathkeeper:v{{ .Major }}"
       - "oryd/oathkeeper:v{{ .Major }}.{{ .Minor }}"
       - "oryd/oathkeeper:v{{ .Major }}.{{ .Minor }}.{{ .Patch }}"
       - "oryd/oathkeeper:{{ .Env.DOCKER_SHORT_TAG }}"
       - "oryd/oathkeeper:latest"
+  - dockerfile: Dockerfile-alpine
+    binaries:
+      - oathkeeper
+    image_templates:
+      - "oryd/oathkeeper:v{{ .Major }}-alpine"
+      - "oryd/oathkeeper:v{{ .Major }}.{{ .Minor }}-alpine"
+      - "oryd/oathkeeper:v{{ .Major }}.{{ .Minor }}.{{ .Patch }}-alpine"
+      - "oryd/oathkeeper:{{ .Env.DOCKER_SHORT_TAG }}-alpine"
+      - "oryd/oathkeeper:latest-alpine"
 
 release:
   prerelease: auto

Dockerfile

@@ -1,7 +1,7 @@
 # To compile this image manually run:
 #
-# $ GO111MODULE=on GOOS=linux GOARCH=amd64 go build && docker build -t oryd/oathkeeper . && rm oathkeeper
-FROM alpine:3.9
+# $ make docker
+FROM alpine:3.10
 
 RUN apk add -U --no-cache ca-certificates
 

Dockerfile-alpine

@@ -0,0 +1,15 @@
+# To compile this image manually run:
+#
+# $ make docker
+FROM alpine:3.10
+
+RUN addgroup -S ory; \
+    adduser -S ory -G ory -D -H -s /bin/nologin
+RUN apk add -U --no-cache ca-certificates
+
+COPY oathkeeper /usr/bin/oathkeeper
+
+USER ory
+
+ENTRYPOINT ["oathkeeper"]
+CMD ["serve"]

Makefile

@@ -51,5 +51,6 @@ docker:
 		packr2 || (GO111MODULE=on go install github.com/gobuffalo/packr/v2/packr2 && packr2)
 		CGO_ENABLED=0 GO111MODULE=on GOOS=linux GOARCH=amd64 go build
 		packr2 clean
-		docker build -t oryd/oathkeeper:unstable.$$(date +'%s') .
+		docker build -t oryd/oathkeeper:dev .
+		docker build -t oryd/oathkeeper:dev-alpine -f Dockerfile-alpine .
 		rm oathkeeper