Add Shopware 6 example (#61)

shopware6/Dockerfile

@@ -0,0 +1,27 @@
+#syntax=docker/dockerfile:1.4
+
+ARG BASE_IMAGE=shopware/docker-base:8.3
+
+# pin versions
+FROM ghcr.io/shopware/docker-base:8.3 as base-image
+FROM ghcr.io/shopware/shopware-cli:latest-php-8.3 AS shopware-cli
+
+# build
+
+FROM shopware-cli as build
+
+ARG SHOPWARE_PACKAGES_TOKEN
+
+ADD . /src
+WORKDIR /src
+
+RUN --mount=type=secret,id=composer_auth,dst=/src/auth.json \
+    --mount=type=cache,target=/root/.composer \
+    --mount=type=cache,target=/root/.npm \
+    /usr/local/bin/entrypoint.sh shopware-cli project ci /src
+
+FROM base-image
+
+COPY --from=build --chown=82 --link /src /var/www/html
+
+EXPOSE 8000