refactor: rename project to keepalive

Dockerfile

@@ -3,9 +3,9 @@ WORKDIR /src
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
-RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /out/db-keepalive .
+RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /out/keepalive .
 
 FROM gcr.io/distroless/static-debian12:nonroot
-COPY --from=build /out/db-keepalive /db-keepalive
+COPY --from=build /out/keepalive /keepalive
 USER nonroot:nonroot
-ENTRYPOINT ["/db-keepalive"]
+ENTRYPOINT ["/keepalive"]