dockerfile but the image is planet-sized

Dockerfile

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+FROM golang:1.15.6-alpine AS builder
+RUN apk add --no-cache git
+ENV GO111MODULE=on \
+    CGO_ENABLED=0 \
+    GOOS=linux \
+    GOARCH=amd64
+
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY main.go ./
+COPY core ./core/
+RUN go build -o gogodiscordo
+
+
+FROM ubuntu:focal
+
+SHELL ["/bin/bash", "-c"]
+
+RUN set -ex;\
+    apt update
+
+RUN set -ex;\
+    apt install -y --no-install-recommends \
+    mbrola \
+    espeak-ng \
+    wget \
+    unzip;
+
+RUN wget --no-check-certificate https://github.com/numediart/MBROLA-voices/archive/master.zip
+RUN unzip master.zip
+RUN mkdir -p /usr/share/mbrola/
+RUN cp -r MBROLA-voices-master/data/* /usr/share/mbrola/
+
+COPY --from=builder /src/gogodiscordo /app/
+COPY core/ app/core
+
+VOLUME ["/app"]
+
+RUN useradd -d /app appuser
+RUN apt install -y ca-certificates
+RUN apt install -y --no-install-recommends ffmpeg 
+COPY config.yaml /app/
+
+RUN rm master.zip
+RUN apt clean -y
+
+WORKDIR /app
+CMD ["./gogodiscordo"]