fix: Dockerfile permissions for Github Actions

Dockerfile

@@ -1,9 +1,11 @@
+# Notes:
+#   - about USER: GitHub Actions requires Docker actions to run as the default Docker user (root). This is because non-root users might not have access to the GITHUB_WORKSPACE directory. 
+#   - about WORKDIR: GitHub recommends avoiding the use of the WORKDIR instruction in Dockerfiles for actions. This is because GitHub sets the working directory path in the GITHUB_WORKSPACE environment variable and mounts this directory at the specified location in the Docker image, potentially overwriting anything that was there. 
+#   - about ENTRYPOINT: GitHub Actions recommend using an absolute path for the entrypoint. 
+
 # Builder stage
 FROM eclipse-temurin:17.0.8.1_1-jre-jammy as builder
 
-# Set the working directory
-WORKDIR /build
-
 # Install dependencies
 RUN apt-get update && \
     apt-get install -y unzip && \
@@ -16,10 +18,10 @@ RUN wget https://downloads.sourceforge.net/project/plantuml/plantuml.jar -O /usr
     chmod +x /usr/local/bin/plantuml
 
 # Copy and setup Structurizr CLI
-COPY structurizr-cli-*.zip /build/
-RUN mkdir /build/structurizr-cli && \
-    unzip structurizr-cli-*.zip -d /build/structurizr-cli && \
-    chmod +x /build/structurizr-cli/structurizr.sh && \
+COPY structurizr-cli-*.zip /
+RUN mkdir /structurizr-cli && \
+    unzip structurizr-cli-*.zip -d /structurizr-cli && \
+    chmod +x /structurizr-cli/structurizr.sh && \
     rm structurizr-cli-*.zip
 
 ### Final image ###
@@ -31,23 +33,17 @@ RUN apt-get update && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/* /var/cache/apt/archives/*
 
-
-### Create a non-root user ###
-RUN useradd -m structurizr
-USER structurizr
-
 # Copy necessary files from builder stage
-COPY --from=builder /build /usr/local/structurizr-cli
+COPY --from=builder /structurizr-cli /usr/local/structurizr-cli
 COPY --from=builder /usr/local/bin/plantuml.jar /usr/local/bin/
 COPY --from=builder /usr/local/bin/plantuml /usr/local/bin/
 
-# Set the working directory and update PATH
-WORKDIR /usr/local/structurizr-cli
+# Update PATH
 ENV PATH /usr/local/structurizr-cli/:/usr/local/bin/:$PATH
 
 # Setup Git configuration
 RUN git config --global user.name github-actions && \
     git config --global user.email [email protected]
 
-# Set the entry point
-ENTRYPOINT ["./structurizr.sh"]
+# Set the entry point with an absolute path
+ENTRYPOINT ["/usr/local/structurizr-cli/structurizr.sh"]