simplify prod stage, move version label to action

Dockerfile

@@ -2,7 +2,7 @@ FROM golang:1.17 as builder
 
 WORKDIR /go/src/mikefarah/yq
 
-COPY . /go/src/mikefarah/yq
+COPY . .
 
 RUN CGO_ENABLED=0 go build .
 # RUN ./scripts/test.sh -- this too often times out in the github pipeline.
@@ -11,20 +11,15 @@ RUN ./scripts/acceptance.sh
 # Choose alpine as a base image to make this useful for CI, as many
 # CI tools expect an interactive shell inside the container
 FROM alpine:3 as production
-
-RUN mkdir /home/yq/
-RUN addgroup -g 1000 yq && \
-    adduser -u 1000 -G yq -s /bin/bash -h /home/yq -D yq
-RUN chown -R yq:yq /home/yq/
+LABEL maintainer="Mike Farah <mikefarah@users.noreply.github.com>"
 
 COPY --from=builder /go/src/mikefarah/yq/yq /usr/bin/yq
-RUN chmod +x /usr/bin/yq
-
-ARG VERSION=none
-LABEL version=${VERSION}
-
-USER yq
 
 WORKDIR /workdir
 
+RUN set -eux; \
+  addgroup -g 1000 yq; \
+  adduser -u 1000 -G yq -s /bin/sh -h /home/yq -D yq
+USER yq
+
 ENTRYPOINT ["/usr/bin/yq"]