Add Dockerfile for project build

Introduced Dockerfile to manage the build process for the project, including its dependencies. This development will standardize the environment, thus making it easier for others to build and run the app. Also added necessary 'passwd' and 'group' files in 'support-files' directory for managing user details in Docker.

Dockerfile

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+# SPDX-FileCopyrightText: 2023 Winni Neessen <wn@neessen.dev>
+#
+# SPDX-License-Identifier: MIT
+
+## Build first
+FROM golang:alpine AS builder
+RUN mkdir /builddir
+ADD cmd/ /builddir/cmd/
+ADD template/ /builddir/template
+ADD *.go /builddir/
+ADD plugins/ /builddir/plugins
+ADD go.mod /builddir/
+ADD go.sum /builddir/
+WORKDIR /builddir
+RUN go mod tidy
+RUN go mod download
+RUN go mod verify
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -a -installsuffix cgo -ldflags \
+  '-w -s -extldflags "-static"' \
+   -o /builddir/logranger github.com/wneessen/logranger/cmd/server
+
+## Create scratch image
+FROM scratch
+LABEL maintainer="wn@neessen.dev"
+COPY ["support-files/passwd", "/etc/passwd"]
+COPY ["support-files/group", "/etc/group"]
+COPY --chown=logranger ["README.md", "/logranger/README.md"]
+COPY --chown=logranger ["etc/logranger.toml", "/etc/logranger/"]
+COPY --from=builder ["/builddir/logranger", "/logranger/logranger"]
+WORKDIR /logranger
+USER logranger
+VOLUME ["/etc/logranger"]
+EXPOSE 9099
+ENTRYPOINT ["/logranger/logranger"]

support-files/group

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+logranger:x:1000:logranger

support-files/passwd

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+logranger:x:1000:1000:Logranger user:/logranger:/bin/false