Add support for Environment Variables in Slack commands.

Author: Rafael Nobre

README.md

@@ -151,7 +151,9 @@ Other, optional parameters:
 **NOTE**: at least either `branch` or `workflow` have to be specified, and of course
 you can specify both if you want to. You're free to specify any number of optional parameters.
 
-An example with all parameters included: `workflow: primary|b: master|tag: v1.0|commit:eee55509f16e7715bdb43308bb55e8736da4e21e|m: start my build!`
+You can also send environment variables that will be available in your workflow with the format: `env[KEY1]:value1|ENV[KEY2]:value2`
+
+An example with all parameters included: `workflow: primary|b: master|tag: v1.0|commit:eee55509f16e7715bdb43308bb55e8736da4e21e|m: start my build!|ENV[DEVICE_NAME]:iPhone 6S|ENV[DEVICE_UDID]:82667b4079914d4aabed9c216620da5dedab630a`
 
 
 ## How to compile & run the server

bitriseapi/bitriseapi.go

@@ -12,14 +12,22 @@ import (
 	"time"
 )
 
+// EnvironmentItem ...
+type EnvironmentItem struct {
+	Name        string 	`json:"mapped_to,omitempty"`
+	Value       string 	`json:"value,omitempty"`
+	IsExpand    bool 	`json:"is_expand,omitempty"`
+}
+
 // BuildParamsModel ...
 type BuildParamsModel struct {
-	CommitHash    string `json:"commit_hash,omitempty"`
-	CommitMessage string `json:"commit_message,omitempty"`
-	Branch        string `json:"branch,omitempty"`
-	Tag           string `json:"tag,omitempty"`
-	PullRequestID *int   `json:"pull_request_id,omitempty"`
-	WorkflowID    string `json:"workflow_id,omitempty"`
+	CommitHash    string 			`json:"commit_hash,omitempty"`
+	CommitMessage string 			`json:"commit_message,omitempty"`
+	Branch        string 			`json:"branch,omitempty"`
+	Tag           string 			`json:"tag,omitempty"`
+	PullRequestID *int   			`json:"pull_request_id,omitempty"`
+	WorkflowID    string 			`json:"workflow_id,omitempty"`
+	Environments  []EnvironmentItem `json:"environments,omitempty"`
 }
 
 // TriggerAPIParamsModel ...