Reduce docker image size from 1.2gb to 22mb

Dockerfile

@@ -1,4 +1,6 @@
-FROM golang:1.20
+FROM golang:alpine AS builder
+
+RUN apk update && apk add --no-cache git
 
 WORKDIR /go/src/app
 COPY src /go/src/app/src
@@ -8,10 +10,16 @@ COPY go.sum /go/src/app/go.sum
 COPY .git /go/src/app/.git
 COPY serra.go /go/src/app/serra.go
 
-
+# build
 RUN go get -v ./...
 RUN go build -ldflags "-X github.com/noqqe/serra/src/serra.Version=`git describe --tags`"  -v serra.go
 
-# Run radsportsalat
+# copy
+FROM scratch
+WORKDIR /go/src/app
+COPY --from=builder /go/src/app/serra /go/src/app/serra
+COPY templates /go/src/app/templates
+
+# run
 EXPOSE 8080
-CMD [ "./serra", "web" ]
+CMD [ "/go/src/app/serra", "web" ]

go.sum

@@ -123,8 +123,6 @@ github.com/youmark/pkcs8 v0.0.0-20181117223130-1be2e3e5546d/go.mod h1:rHwXgn7Jul
 github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a h1:fZHgsYlfvtyqToslyjUt3VOPF4J7aK/3MPcK7xp3PDk=
 github.com/youmark/pkcs8 v0.0.0-20201027041543-1326539a0a0a/go.mod h1:ul22v+Nro/R083muKhosV54bj5niojjWZvU8xrevuH4=
 github.com/yuin/goldmark v1.4.13/go.mod h1:6yULJ656Px+3vBD8DxQVa3kxgyrAnzto9xy5taEt/CY=
-go.mongodb.org/mongo-driver v1.11.2 h1:+1v2rDQUWNcGW7/7E0Jvdz51V38XXxJfhzbV17aNHCw=
-go.mongodb.org/mongo-driver v1.11.2/go.mod h1:s7p5vEtfbeR1gYi6pnj3c3/urpbLv2T5Sfd6Rp2HBB8=
 go.mongodb.org/mongo-driver v1.11.3 h1:Ql6K6qYHEzB6xvu4+AU0BoRoqf9vFPcc4o7MUIdPW8Y=
 go.mongodb.org/mongo-driver v1.11.3/go.mod h1:PTSz5yu21bkT/wXpkS7WR5f0ddqw5quethTUn9WM+2g=
 golang.org/x/arch v0.0.0-20210923205945-b76863e36670 h1:18EFjUmQOcUvxNYSkA6jO9VAiXCnxFY6NyDX0bHDmkU=