ci: new docker release workflows

Dockerfile

@@ -1,10 +1,24 @@
-FROM alpine:latest as certs
+FROM golang:1.22-alpine3.20 AS build
+
+ARG DOCKER_META_VERSION="untracked"
+
 RUN apk --update add ca-certificates
 
+WORKDIR /webdav/
+
+COPY ./go.mod ./
+COPY ./go.sum ./
+RUN go mod download
+
+COPY . /webdav/
+RUN go build -o main -ldflags="-X 'github.com/hacdias/webdav/v4/cmd.version=$DOCKER_META_VERSION'" .
+
 FROM scratch
-COPY --from=certs /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+
+COPY --from=build /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
+COPY --from=build /webdav/main /bin/webdav
 
 EXPOSE 80
-COPY webdav /webdav
 
-ENTRYPOINT [ "/webdav" ]
+ENTRYPOINT [ "webdav" ]
+CMD [ "-p", "80" ]