added docker file and flag for nkey seed file

Dockerfile

@@ -0,0 +1,69 @@
+# build stage
+FROM golang:alpine AS build-env
+RUN apk --no-cache add build-base git gcc
+RUN git clone https://github.com/RaaLabs/steward.git
+WORKDIR /go/steward/cmd
+RUN go build -o steward
+
+# final stage
+FROM alpine
+WORKDIR /app
+COPY --from=build-env /go/steward/cmd/steward /app/
+
+ENV CONFIG_FOLDER "./etc"
+ENV SOCKET_FOLDER "./tmp"
+ENV DATABASE_FOLDER "./var/lib"
+ENV NODE_NAME ""
+ENV BROKER_ADDRESS "127.0.0.1:4222"
+ENV PROFILING_PORT ""
+ENV PROM_HOST_AND_PORT ""
+ENV DEFAULT_MESSAGE_TIMEOUT 10
+ENV DEFAULT_MESSAGE_RETRIES 3
+ENV SUBSCRIBERS_DATA_FOLDER "./var"
+ENV CENTRAL_NODE_NAME ""
+ENV ROOT_CA_PATH ""
+ENV NKEY_SEED_FILE ""
+
+ENV START_PUB_REQ_HELLO 60
+
+ENV START_SUB_REQ_ERROR_LOG ""
+ENV START_SUB_REQ_HELLO ""
+ENV START_SUB_REQ_TO_FILE_APPEND ""
+ENV START_SUB_REQ_TO_FILE ""
+ENV START_SUB_REQ_PING ""
+ENV START_SUB_REQ_PONG ""
+ENV START_SUB_REQ_CLI_COMMAND ""
+ENV START_SUB_REQN_CLI_COMMAND ""
+ENV START_SUB_REQ_TO_CONSOLE ""
+ENV START_SUB_REQ_HTTP_GET ""
+ENV START_SUB_REQ_TAIL_FILE ""
+
+CMD ["ash","-c","/app/steward\
+    -configFolder=$CONFIG_FOLDER\
+    -socketFolder=$SOCKET_FOLDER\
+    -databaseFolder=$DATABASE_FOLDER\
+    -nodeName=$NODE_NAME\
+    -brokerAddress=$BROKER_ADDRESS\
+    -profilingPort=$PROFILING_PORT\
+    -promHostAndPort=$PROM_HOST_AND_PORT\
+    -defaultMessageTimeout=$DEFAULT_MESSAGE_TIMEOUT\
+    -defaultMessageRetries=$DEFAULT_MESSAGE_RETRIES\
+    -subscribersDataFolder=SUBSCRIBERS_DATA_FOLDER\
+    -centralNodeName=$CENTRAL_NODE_NAME\
+    -rootCAPath=$ROOT_CA_PATH\
+    -nkeySeedFile=$NKEY_SEED_FILE\
+
+    -startPubREQHello=$START_PUB_REQ_HELLO\
+
+    -startSubREQErrorLog=$START_SUB_REQ_ERROR_LOG\
+    -startSubREQHello=$START_SUB_REQ_HELLO\
+    -startSubREQToFileAppend=$START_SUB_REQ_TO_FILE_APPEND\
+    -startSubREQToFile=$START_SUB_REQ_TO_FILE\
+    -startSubREQPing=$START_SUB_REQ_PING\
+    -startSubREQPong=$START_SUB_REQ_PONG\
+    -startSubREQCliCommand=$START_SUB_REQ_CLI_COMMAND\
+    -startSubREQnCliCommand=$START_SUB_REQN_CLI_COMMAND\
+    -startSubREQToConsole=$START_SUB_REQ_TO_CONSOLE\
+    -startSubREQHttpGet=$START_SUB_REQ_HTTP_GET\
+    -startSubREQTailFile=$START_SUB_REQ_TAIL_FILE\
+    "]

configuration_flags.go

@@ -102,9 +102,11 @@ type Configuration struct {
 	// Path to the certificate of the root CA
 	RootCAPath string
 
+	// Full path to the NKEY's seed file
+	NkeySeedFile string
+
 	// Make the current node send hello messages to central at given interval in seconds
 	StartPubREQHello int
-
 	// Start the central error logger.
 	// Takes a comma separated string of nodes to receive from or "*" for all nodes.
 	StartSubREQErrorLog flagNodeSlice
@@ -152,6 +154,7 @@ func newConfigurationDefaults() Configuration {
 		SubscribersDataFolder:   "./var",
 		CentralNodeName:         "",
 		RootCAPath:              "",
+		NkeySeedFile:            "",
 		StartSubREQErrorLog:     flagNodeSlice{Values: []node{}},
 		StartSubREQHello:        flagNodeSlice{OK: true, Values: []node{"*"}},
 		StartSubREQToFileAppend: flagNodeSlice{OK: true, Values: []node{"*"}},
@@ -195,6 +198,7 @@ func (c *Configuration) CheckFlags() error {
 	flag.StringVar(&c.SubscribersDataFolder, "subscribersDataFolder", fc.SubscribersDataFolder, "The data folder where subscribers are allowed to write their data if needed")
 	flag.StringVar(&c.CentralNodeName, "centralNodeName", fc.CentralNodeName, "The name of the central node to receive messages published by this node")
 	flag.StringVar(&c.RootCAPath, "rootCAPath", fc.RootCAPath, "If TLS, enter the path for where to find the root CA certificate")
+	flag.StringVar(&c.NkeySeedFile, "nkeySeedFile", fc.NkeySeedFile, "The full path of the nkeys seed file")
 
 	flag.IntVar(&c.StartPubREQHello, "startPubREQHello", fc.StartPubREQHello, "Make the current node send hello messages to central at given interval in seconds")