chore: Rename Dockerfile-alpine to Dockerfile.alpine

Dockerfile.alpine

@@ -0,0 +1,23 @@
+FROM alpine:3.21 AS base-alpine
+RUN apk add --no-cache bash procps drill coreutils libidn curl socat openssl xxd \
+    && addgroup testssl \
+    && adduser -G testssl -g "testssl user" -s /bin/bash -D testssl \
+    && ln -s /home/testssl/testssl.sh /usr/local/bin/testssl.sh
+
+# Runtime config:
+USER testssl
+ENTRYPOINT ["testssl.sh"]
+CMD ["--help"]
+
+# Final image stage (add `testssl.sh` project files)
+# Choose either one as the final stage (defaults to last stage, `dist-git`)
+
+# 27MB Image (Local repo copy from build context, uses `.dockerignore`):
+FROM base-alpine AS dist-local
+COPY --chown=testssl:testssl . /home/testssl/
+
+# 35MB Image (Remote repo clone, cannot filter content through `.dockerignore`):
+FROM base-alpine AS dist-git
+ARG GIT_URL=https://github.com/testssl/testssl.sh.git
+ARG GIT_BRANCH
+ADD --chown=testssl:testssl ${GIT_URL}#${GIT_BRANCH?branch-required} /home/testssl