why am I building on alpine 3.11

.drone.yml

@@ -10,18 +10,20 @@ platform:
 steps:
 - name: build-2.7
   commands:
-  - docker build --pull -t pdr.nephatrine.net/nephatrine/docker-registry:2.7 -f Dockerfile-2.7 .
+  - docker build --pull -t pdr.nephatrine.net/nephatrine/docker-registry:2.7 .
   - HOME=/mnt/config/home docker push pdr.nephatrine.net/nephatrine/docker-registry:2.7
   - docker tag pdr.nephatrine.net/nephatrine/docker-registry:2.7 nephatrine/docker-registry:2.7
   - HOME=/mnt/config/home docker push nephatrine/docker-registry:2.7
   - docker rmi pdr.nephatrine.net/nephatrine/docker-registry:2.7
 - name: build-latest
   commands:
-  - docker build --pull -t pdr.nephatrine.net/nephatrine/docker-registry:latest .
+  - docker tag nephatrine/docker-registry:2.7 pdr.nephatrine.net/nephatrine/docker-registry:latest
   - HOME=/mnt/config/home docker push pdr.nephatrine.net/nephatrine/docker-registry:latest
   - docker tag pdr.nephatrine.net/nephatrine/docker-registry:latest nephatrine/docker-registry:latest
   - HOME=/mnt/config/home docker push nephatrine/docker-registry:latest
   - docker rmi pdr.nephatrine.net/nephatrine/docker-registry:latest
+  depends_on:
+  - build-2.7
 
 ---
 kind: pipeline
@@ -49,6 +51,6 @@ trigger:
 
 ---
 kind: signature
-hmac: 78543eb4b3603a3e8c0426c86ac6460446aac1d9a090c82f584e3ac3c7588850
+hmac: c122eaf8c132be3935cae0d71d03187a4e68c8745b7e6c4c2bdd74b2091b1dbc
 
 ...

Dockerfile-2.7

@@ -1,28 +0,0 @@
-FROM nephatrine/alpine-s6:3.11
-LABEL maintainer="Daniel Wolf <nephatrine@gmail.com>"
-
-ARG REGISTRY_VERSION=release/2.7
-ARG GOPATH="/usr"
-
-RUN echo "====== COMPILE REGISTRY ======" \
- && mkdir /etc/registry \
- && apk add python3 \
- && apk add --virtual .build-registry build-base git go \
- && cd /usr/src \
- && go get -d github.com/docker/distribution/cmd/registry \
- && cd github.com/docker/distribution/cmd/registry \
- && git fetch && git fetch --tags \
- && git checkout "$REGISTRY_VERSION" && cd /usr/src \
- && go install github.com/docker/distribution/cmd/registry \
- && cp github.com/docker/distribution/cmd/registry/config-example.yml /etc/registry/config-example.yml \
- && cp /etc/registry/config-example.yml /etc/registry/config.yml \
- && sed -i 's~/var/lib/registry~/mnt/config/data~g' /etc/registry/config.yml \
- && sed -i 's~/etc/registry~/mnt/config/etc/registry~g' /etc/registry/config.yml \
- && cd /usr/src && rm -rf /usr/pkg/* /usr/src/* \
- && apk del --purge .build-registry && rm -rf /var/cache/apk/*
-
-ENV REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY=/mnt/config/data
-ENV REGISTRY_DATA_DIR=${REGISTRY_STORAGE_FILESYSTEM_ROOTDIRECTORY}/docker/registry/v2
-COPY override /
-
-EXPOSE 5000/tcp