Add Docker.json and update Dockerfile. See #157

Docker.json

@@ -0,0 +1,10 @@
+{
+  "port": 80,
+  "address": "",
+  "database": "/etc/database.db",
+  "scope": "/srv",
+  "allowCommands": true,
+  "allowEdit": true,
+  "allowNew": true,
+  "commands": []
+}

Dockerfile

@@ -1,9 +1,18 @@
 FROM golang:alpine
+
 COPY . /go/src/github.com/hacdias/filemanager
+
 WORKDIR /go/src/github.com/hacdias/filemanager
 RUN apk add --no-cache git
 RUN go get ./...
+
 WORKDIR /go/src/github.com/hacdias/filemanager/cmd/filemanager
-RUN go build
-ENTRYPOINT ["/go/src/github.com/hacdias/filemanager/cmd/filemanager/filemanager"]
-CMD ["-h"]
+RUN go install
+
+VOLUME /srv
+EXPOSE 80
+
+COPY Docker.json /etc/config.json
+
+ENTRYPOINT ["/go/bin/filemanager"]
+CMD ["--config", "/etc/config.json"]