add alpine rootless

3.15/rootless/Dockerfile

@@ -0,0 +1,12 @@
+FROM alpine:3.15
+  
+RUN set -eu; \
+    sed -i 's/dl-cdn.alpinelinux.org/mirrors.ustc.edu.cn/g' /etc/apk/repositories; \
+    apk add --no-cache tzdata \
+    && cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
+    && echo "Asia/Shanghai" > /etc/timezone \
+    && apk del tzdata; \
+    addgroup -g 1000 fs \
+    && adduser -u 1000 -G fs -s /bin/sh -D fs 
+
+USER fs