Update Dockerfile

Dockerfile

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+#syntax=docker/dockerfile:1.2
+
+# base installs required dependencies and runs go mod download to cache dependencies
+FROM --platform=${BUILDPLATFORM} docker.io/golang:1.18-alpine AS base
+RUN apk --update --no-cache add bash build-base
+
+WORKDIR /src
+COPY go.* .
+RUN go mod download
+
+# build creates all needed binaries
+FROM base AS build
+ARG TARGETOS
+ARG TARGETARCH
+RUN --mount=target=. \
+    --mount=type=cache,target=/root/.cache/go-build \
+    GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -trimpath -o /out/ ./cmd/...
+
+# dendrite base image; mainly creates a user and switches to it
+FROM alpine:3.15 AS dendrite-base
+RUN addgroup dendrite && adduser dendrite -G dendrite -u 1337 -D
+USER dendrite
+WORKDIR /home/dendrite
+
+# polylith image, only contains the polylith binary
+FROM dendrite-base AS image-polylith
+COPY --from=build /out/dendrite-polylith-multi /usr/bin/
+
+ENTRYPOINT ["/usr/bin/dendrite-polylith-multi"]
+
+# monolith image
+FROM dendrite-base AS image-monolith
+COPY --from=build /out/create-account /usr/bin/create-account
+COPY --from=build /out/generate-config /usr/bin/generate-config
+COPY --from=build /out/generate-keys /usr/bin/generate-keys
+COPY --from=build /out/dendrite-monolith-server /usr/bin/dendrite-monolith-server
+
+ENTRYPOINT ["/usr/bin/dendrite-monolith-server"]
+EXPOSE 8008 8448
+
+# complement image
+FROM base AS image-complement
+RUN apk add --no-cache sqlite openssl ca-certificates
+COPY --from=build /out/* /usr/bin/
+RUN rm /usr/bin/dendrite-polylith-multi
+
+WORKDIR /dendrite
+RUN /usr/bin/generate-keys --private-key matrix_key.pem && \
+    mkdir /ca && \
+    openssl genrsa -out /ca/ca.key 2048 && \
+    openssl req -new -x509 -key /ca/ca.key -days 3650 -subj "/C=GB/ST=London/O=matrix.org/CN=Complement CA" -out /ca/ca.crt
+
+ENV SERVER_NAME=localhost
+ENV API=0
+EXPOSE 8008 8448
+
+# At runtime, generate TLS cert based on the CA now mounted at /ca
+# At runtime, replace the SERVER_NAME with what we are told
+CMD /usr/bin/generate-keys --server $SERVER_NAME --tls-cert server.crt --tls-key server.key --tls-authority-cert /ca/ca.crt --tls-authority-key /ca/ca.key && \
+ /usr/bin/generate-config -server $SERVER_NAME --ci > dendrite.yaml && \
+ cp /ca/ca.crt /usr/local/share/ca-certificates/ && update-ca-certificates && \
+ /usr/bin/dendrite-monolith-server --tls-cert server.crt --tls-key server.key --config dendrite.yaml -api=${API:-0}