docker: Add alpine image (#1566)

Closes #1558

.goreleaser.yml

@@ -49,14 +49,14 @@ snapshot:
   name_template: "{{ .Tag }}-next"
 changelog:
   sort: asc
-brew:
-  github:
-    owner: ory
-    name: homebrew-hydra
-  homepage:  https://www.ory.sh
-  commit_author:
-    name: ory
-    email: [email protected]
+brews:
+  - github:
+      owner: ory
+      name: homebrew-hydra
+    homepage:  https://www.ory.sh
+    commit_author:
+      name: ory
+      email: [email protected]
 
 scoop:
   bucket:
@@ -68,12 +68,24 @@ scoop:
     email: [email protected]
 
 dockers:
-  - image_templates:
+  - dockerfile: Dockerfile
+    binaries:
+      - hydra
+    image_templates:
       - "oryd/hydra:v{{ .Major }}"
       - "oryd/hydra:v{{ .Major }}.{{ .Minor }}"
       - "oryd/hydra:v{{ .Major }}.{{ .Minor }}.{{ .Patch }}"
       - "oryd/hydra:{{ .Env.DOCKER_SHORT_TAG }}"
       - "oryd/hydra:latest"
+  - dockerfile: Dockerfile-alpine
+    binaries:
+      - hydra
+    image_templates:
+      - "oryd/hydra:v{{ .Major }}-alpine"
+      - "oryd/hydra:v{{ .Major }}.{{ .Minor }}-alpine"
+      - "oryd/hydra:v{{ .Major }}.{{ .Minor }}.{{ .Patch }}-alpine"
+      - "oryd/hydra:{{ .Env.DOCKER_SHORT_TAG }}-alpine"
+      - "oryd/hydra:latest-alpine"
 
 release:
   prerelease: auto

Dockerfile-alpine

@@ -0,0 +1,13 @@
+# To compile this image manually run:
+#
+# $ GO111MODULE=on GOOS=linux GOARCH=amd64 go build && docker build -t oryd/hydra:v1.0.0-rc.7_oryOS.10 . && rm hydra
+FROM alpine:3.9
+
+RUN apk add -U --no-cache ca-certificates
+
+COPY hydra /usr/bin/hydra
+
+USER 1000
+
+ENTRYPOINT ["hydra"]
+CMD ["serve", "all"]

oauth2/fosite_store_memory.go

@@ -99,7 +99,7 @@ func (s *FositeMemoryStore) GetClients(ctx context.Context, limit, offset int) (
 	}
 
 	clients := map[string]client.Client{}
-	for _, c := range interim  {
+	for _, c := range interim {
 		clients[c.GetID()] = c
 	}
 

oauth2/fosite_store_sql.go

@@ -231,7 +231,7 @@ func (s *FositeSQLStore) GetClients(ctx context.Context, limit, offset int) (map
 	}
 
 	clients := map[string]client.Client{}
-	for _, c := range interim  {
+	for _, c := range interim {
 		clients[c.GetID()] = c
 	}