Update Dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM docker.io/library/golang:1.15-alpine as builder
+FROM docker.io/library/golang:1.19-alpine as builder
 
 MAINTAINER Jack Murdock <jack_murdock@comcast.com>
 
@@ -12,13 +12,16 @@ ARG BUILDTIME
 RUN apk add --no-cache --no-progress \
     ca-certificates \
     make \
+    curl \
     git \
     openssh \
     gcc \
     libc-dev \
     upx
 
-RUN go get github.com/geofffranks/spruce/cmd/spruce && chmod +x /go/bin/spruce
+RUN mkdir -p /go/bin && \
+    curl -o /go/bin/spruce https://github.com/geofffranks/spruce/releases/download/v1.29.0/spruce-linux-amd64 && \
+    chmod +x /go/bin/spruce
 COPY . .
 RUN make test release