added Dockerfile

Dockerfile

@@ -0,0 +1,8 @@
+# Copyright (c) 2022 Bryan Joshua Pedini
+# License: MIT · see LICENSE file for more details
+ARG GO_VERSION "$GO_VERSION"
+
+FROM golang:${GO_VERSION}
+
+RUN apk add --no-cache git; \
+    rm -rf /var/cache/apk