download the prebuilt jar...

Dockerfile

@@ -1,25 +1,15 @@
-FROM openjdk:16-alpine as builder
-
-RUN apk --no-cache add \
-    patch \
-    maven \
-    git
-
-RUN git config --global user.email "papermcbuilder@vanwa.ch"
-RUN git config --global user.name "Vanwa papermc builder"
-
-ENV VERSION=f521a18a17f32997793b2d0b2ebcd7890f200fc8
-RUN git clone https://github.com/PaperMC/Paper.git
-
-WORKDIR /Paper
-RUN git checkout "$VERSION"
-RUN ./gradlew applyPatches
-RUN ./gradlew build
-RUN mv /Paper/Paper-Server/build/libs/Paper-Server-*-dev.jar /Paper/Paper-Server/build/libs/paper.jar
-
 FROM thallian/confd-env:latest
 
-COPY --from=builder /Paper/Paper-Server/build/libs/paper.jar /var/lib/minecraft/paper.jar
+RUN addgroup minecraft -g 2222
+RUN adduser -u 2222 -h /var/lib/minecraft -D -G minecraft minecraft
+
+ENV VERSION=1.17.1
+ENV SERIAL=157
+ENV SHA256_SUM=862b043fbc0be948c380bced4aee224200568954db941ca6f6ac568cab263991
+RUN wget -O /var/lib/minecraft/paper.jar \
+	https://papermc.io/api/v2/projects/paper/versions/$VERSION/builds/$SERIAL/downloads/paper-$VERSION-$SERIAL.jar 
+
+RUN echo "$SHA256_SUM  /var/lib/minecraft/paper.jar" | sha256sum -c - || exit 1
 
 RUN apk add --no-cache \
     openssl
@@ -27,9 +17,6 @@ RUN apk add --no-cache \
 RUN apk add --no-cache --repository=http://dl-cdn.alpinelinux.org/alpine/edge/testing \
     openjdk16-jre-headless
 
-RUN addgroup minecraft -g 2222
-RUN adduser -u 2222 -h /var/lib/minecraft -D -G minecraft minecraft
-
 RUN mkdir -p /etc/services.d/minecraft/
 
 ADD /rootfs /