Fix docker syntax error on Github action

Signed-off-by: Bryan Frimin <bryan@getprobo.com>

Dockerfile

@@ -1,23 +1,16 @@
-# syntax=docker/dockerfile:1
 FROM ubuntu:24.04
 
 LABEL org.opencontainers.image.source="https://github.com/getprobo/probo"
 LABEL org.opencontainers.image.licenses="MIT"
 LABEL org.opencontainers.image.vendor="Probo Inc"
 
-WORKDIR /app
-
-# Install dependencies and create user
 RUN useradd -m probo && \
     apt-get update && \
     apt-get upgrade -y && \
     apt-get install -y ca-certificates && \
     rm -rf /var/lib/apt/lists/*
 
-# Copy the architecture-specific pre-built binary from GoReleaser
 COPY probod /usr/local/bin/probod
-
-# Ensure the binary is executable
 RUN chmod +x /usr/local/bin/probod
 
 USER probo