fix: Simplify Dockerfile and make it compatible with goreleaser

Author: afsmeira

Dockerfile

@@ -1,20 +1,11 @@
-FROM alpine:latest as alpine
+FROM alpine:latest AS alpine
 
-RUN apk add -U --no-cache ca-certificates
+# We need git to automatically get the changes of a deployment
+RUN apk add -U --no-cache ca-certificates git
 
-# Build a statically linked git binary
-ENV GIT_VERSION "v2.30.0"
-WORKDIR /tmp/git
-RUN apk add -U --no-cache git alpine-sdk autoconf automake zlib-dev zlib-static zlib
-RUN \
-  git clone --depth=1 git://github.com/git/git -b $GIT_VERSION /tmp/git && \
-  make configure && \
-  ./configure prefix=/tmp CFLAGS="${CFLAGS} -static" && \
-  make install NO_TCLTK="YesPlease"
+# See https://goreleaser.com/customization/dockers_v2/#how-it-works
+ARG TARGETPLATFORM
 
-FROM scratch
 WORKDIR /workdir
-COPY pulse-event-cli /bin/
-COPY --from=alpine /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
-COPY --from=alpine /tmp/bin/git /bin/git
+COPY $TARGETPLATFORM/pulse-event-cli /bin/
 ENTRYPOINT ["pulse-event-cli"]