Initial Dockerfile and Pipeline

Dockerfile

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+FROM alpine:latest as builder
+
+WORKDIR /work
+RUN \
+    apk update && \
+    apk add curl && \
+    curl -L -o master.zip https://github.com/getkirby/plainkit/archive/master.zip  && \
+    unzip master.zip    && \
+    cd plainkit-master  && \
+    rm -rf README.md .editorconfig .gitignore .htaccess composer.json
+
+############################
+
+FROM php:8-fpm-alpine3.13
+
+EXPOSE 9000
+COPY --from=builder /work/plainkit-master /site