lint: fix Dockerfile build check warnings

result/Dockerfile

@@ -18,7 +18,7 @@ RUN npm ci && \
 
 COPY . .
 
-ENV PORT 80
+ENV PORT=80
 EXPOSE 80
 
 ENTRYPOINT ["/usr/bin/tini", "--"]

seed-data/Dockerfile

@@ -13,4 +13,4 @@ COPY . .
 # create POST data files with ab friendly formats
 RUN python make-data.py
 
-CMD /seed/generate-votes.sh
+CMD ["/seed/generate-votes.sh"]

vote/Dockerfile

@@ -1,4 +1,4 @@
-# Define a base stage that uses the official python runtime base image
+# base defines a base stage that uses the official python runtime base image
 FROM python:3.11-slim AS base
 
 # Add curl for healthcheck
@@ -13,14 +13,13 @@ WORKDIR /usr/local/app
 COPY requirements.txt ./requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
 
-# Define a stage specifically for development, where it'll watch for
-# filesystem changes
+# dev defines a stage for development, where it'll watch for filesystem changes
 FROM base AS dev
 RUN pip install watchdog
 ENV FLASK_ENV=development
 CMD ["python", "app.py"]
 
-# Define the final stage that will bundle the application for production
+# final defines the stage that will bundle the application for production
 FROM base AS final
 
 # Copy our code from the current folder to the working directory inside the container

worker/Dockerfile

@@ -6,7 +6,9 @@
 # to build for a different platform than your host, use --platform=<platform>
 # for example, if you were on Intel (amd64) and wanted to build for ARM, you would use:
 # docker buildx build --platform "linux/arm64/v8" .
-FROM --platform=${BUILDPLATFORM} mcr.microsoft.com/dotnet/sdk:7.0 as build
+
+# build compiles the program for the builder's local platform
+FROM --platform=${BUILDPLATFORM} mcr.microsoft.com/dotnet/sdk:7.0 AS build
 ARG TARGETPLATFORM
 ARG TARGETARCH
 ARG BUILDPLATFORM
@@ -23,4 +25,4 @@ RUN dotnet publish -c release -o /app -a $TARGETARCH --self-contained false --no
 FROM mcr.microsoft.com/dotnet/runtime:7.0
 WORKDIR /app
 COPY --from=build /app .
-ENTRYPOINT ["dotnet", "Worker.dll"]
+ENTRYPOINT ["dotnet", "Worker.dll"]