fix(docker): set SHELL to /usr/bin/sh for quarkus-micro-image:2.0

The Quarkus micro image 2.0 no longer ships /bin/sh (only /usr/bin/sh).
Docker's default shell is /bin/sh, so RUN commands fail with
'exec /bin/sh: no such file or directory'. Set SHELL explicitly to
/usr/bin/sh to keep the small final image while letting Docker run
RUN commands.

Dockerfile

@@ -9,6 +9,7 @@ RUN microdnf install -y curl-minimal && microdnf clean all \
  && cp -rP /etc/ssl /out/etc/
 
 FROM quay.io/quarkus/quarkus-micro-image:2.0
+SHELL ["/usr/bin/sh", "-c"]
 WORKDIR /work/
 COPY build-output/shot-crafter-calculator-1.0.0-runner /work/application
 COPY --from=curl-builder /out/ /