Update main.workflow

adding a main workflow

.github/main.workflow

@@ -1,8 +1,3 @@
-workflow "Skookum Action" {
-  on = "push"
-  resolves = ["Cat a file"]
-}
-
 action "My first action" {
   uses = "docker://alpine:3.8"
   args = "touch random.txt && echo done"
@@ -16,3 +11,19 @@ action "Cat a file" {
   args = "ls"
   needs = ["My first action"]
 }
+
+workflow "Skookum Demo" {
+  on = "push"
+  resolves = ["docker://alpine:latest-1"]
+}
+
+action "docker://alpine:latest" {
+  uses = "docker://alpine:latest"
+  args = "touch example.txt"
+}
+
+action "docker://alpine:latest-1" {
+  uses = "docker://alpine:latest"
+  needs = ["docker://alpine:latest"]
+  args = "ls"
+}