Add simple example for how to run Sagui inside a container

.dockerignore

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+.github/
+build/
+docs/
+lib/
+_config.yml
+ChangeLog
+Dockerfile

Dockerfile

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+######################################################################
+# Copyright (c) 2024 Silvio Clecio (silvioprog) <[email protected]>
+#
+# SPDX-License-Identifier: MIT
+######################################################################
+
+# podman build --platform linux/amd64 -t hello_sagui .
+# podman run --platform linux/amd64 --rm -it -p 8080:8080 hello_sagui
+
+FROM alpine:3.19.1 AS builder
+
+RUN apk add --no-cache \
+  make \
+  autoconf \
+  automake \
+  clang \
+  cmake
+
+WORKDIR /app
+
+COPY . /app/
+
+RUN mkdir build && \
+  cd build/ && \
+  cmake -DBUILD_SHARED_LIBS=OFF .. && \
+  make example_httpsrv
+RUN strip /app/build/examples/example_httpsrv
+
+FROM scratch
+WORKDIR /app
+COPY --from=builder /lib/ld-musl-x86_64.so.1 /lib/ld-musl-x86_64.so.1
+COPY --from=builder /app/build/examples/example_httpsrv .
+ENTRYPOINT ["./example_httpsrv", "8080"]