Add missing bake definition file

Author: thespad

docker-bake.hcl

@@ -0,0 +1,23 @@
+target "docker-metadata-action" {}
+
+group "default" {
+  targets = ["image-local"]
+}
+
+target "image" {
+  inherits = ["docker-metadata-action"]
+}
+
+target "image-local" {
+  inherits = ["image"]
+  output = ["type=docker"]
+}
+
+target "image-all" {
+  inherits = ["image"]
+  platforms = [
+    "linux/amd64",
+    "linux/arm64",
+    "linux/arm/v7"
+  ]
+}