Add Containerfile

Containerfile

@@ -0,0 +1,14 @@
+FROM golang:alpine AS builder
+
+WORKDIR /go/src/git.zio.sh/gearheads/webfinger
+COPY . .
+
+RUN apk update && \
+    go get -d -v ./... && \
+    go install
+
+FROM alpine:latest
+
+COPY --from=builder /go/bin/webfinger /usr/local/bin/webfinger
+
+CMD ["webfinger"]