Add comment explaining reasoning for calling uv sync twice.

I was rather confused why there were 2 `uv sync` calls in the file and found out more from `uv help sync`. Added a comment to make it clearer.
astral-sh · Sep 10, 2024 · ca57929 · ca57929
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commit ca57929
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diff --git a/Dockerfile b/Dockerfile
@@ -17,6 +17,7 @@ RUN --mount=type=cache,target=/root/.cache/uv \
     uv sync --frozen --no-install-project --no-dev
 
 # Then, add the rest of the project source code and install it
+# Installing separately from its dependencies allows optimal layer caching
 ADD . /app
 RUN --mount=type=cache,target=/root/.cache/uv \
     uv sync --frozen --no-dev