feat: add ci/drone

drone/Dockerfile

@@ -0,0 +1,41 @@
+FROM golang:alpine AS Builder
+
+WORKDIR /src
+
+ENV DRONE_VERSION "v2.5.0"
+ENV CGO_CFLAGS="-g -O2 -Wno-return-local-addr"
+
+RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories && \
+    echo "Asia/Shanghai" > /etc/timezone && \
+    apk add build-base git ca-certificates && \
+    git clone https://github.com/harness/drone.git drone-${DRONE_VERSION}
+
+WORKDIR /src/drone-${DRONE_VERSION}
+
+RUN go env -w GOPROXY="https://goproxy.cn,direct" && \
+    go mod download && \
+    go build -ldflags "-extldflags \"-static\"" -tags="nolimit" github.com/drone/drone/cmd/drone-server
+
+
+FROM alpine
+
+EXPOSE 80 443
+
+VOLUME /data
+
+RUN [ ! -e /etc/nsswitch.conf ] && echo 'hosts: files dns' > /etc/nsswitch.conf
+
+ENV GODEBUG netdns=go
+ENV XDG_CACHE_HOME /data
+ENV DRONE_DATABASE_DRIVER sqlite3
+ENV DRONE_DATABASE_DATASOURCE /data/database.sqlite
+ENV DRONE_RUNNER_OS=linux
+ENV DRONE_RUNNER_ARCH=amd64
+ENV DRONE_SERVER_PORT=:80
+ENV DRONE_SERVER_HOST=localhost
+ENV DRONE_DATADOG_ENABLED=true
+ENV DRONE_DATADOG_ENDPOINT=https://stats.drone.ci/api/v1/series
+
+COPY --from=Builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=Builder /src/drone-v2.5.0/drone-server /bin/drone-server
+ENTRYPOINT ["/bin/drone-server"]