test: add examples for alpine docker

Author: aminya

dev/docker/examples/alpine-gcc.dockerfile

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+#### Building (example)
+FROM aminya/setup-cpp-alpine-gcc AS builder
+
+COPY ./dev/cpp_vcpkg_project /home/app
+WORKDIR /home/app
+RUN task build
+
+#### Running environment
+# use a fresh image as the runner
+FROM alpine:3.21 AS runner
+
+# copy the built binaries and their runtime dependencies
+COPY --from=builder /home/app/build/my_exe/Release/ /home/app/
+WORKDIR /home/app/
+ENTRYPOINT ["./my_exe"]

dev/docker/examples/alpine-llvm.dockerfile

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+#### Building (example)
+FROM aminya/setup-cpp-alpine-llvm AS builder
+
+COPY ./dev/cpp_vcpkg_project /home/app
+WORKDIR /home/app
+RUN task build
+
+#### Running environment
+# use a fresh image as the runner
+FROM alpine:3.21 AS runner
+
+# copy the built binaries and their runtime dependencies
+COPY --from=builder /home/app/build/my_exe/Release/ /home/app/
+WORKDIR /home/app/
+ENTRYPOINT ["./my_exe"]

dev/docker/examples/alpine-mingw.dockerfile

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+#### Cross Building (example)
+FROM aminya/setup-cpp-alpine-mingw AS builder-mingw
+
+COPY ./dev/cpp_vcpkg_project /home/app
+WORKDIR /home/app
+RUN bash -c 'source ~/.cpprc \
+    && task build_cross_mingw'