Split backend service into checker and generator

Both are linked through a unix socket.

Dockerfile-checker

@@ -0,0 +1,22 @@
+FROM golang:1-alpine as gobuild
+
+RUN apk add --no-cache git
+
+WORKDIR /go/src/srs.epita.fr/fic-server/
+
+COPY go.mod go.sum ./
+COPY settings settings/
+COPY libfic ./libfic/
+COPY checker ./checker/
+
+RUN go get -d -v ./checker && \
+    go build -v -buildvcs=false -o checker/checker ./checker
+
+
+FROM alpine:3.18
+
+WORKDIR /srv
+
+ENTRYPOINT ["/srv/checker"]
+
+COPY --from=gobuild /go/src/srs.epita.fr/fic-server/checker/checker /srv/checker