chore(ci): Update docker file to set environment variable at runtime

Dockerfile

@@ -6,16 +6,15 @@ WORKDIR /app
 # Install dependencies
 COPY pyproject.toml poetry.lock ./
 
-RUN --mount=type=secret,id=GUILD_ID,target=/run/secrets/GUILD_ID \
-    --mount=type=secret,id=BOT_TOKEN,target=/run/secrets/BOT_TOKEN \
-    GUILD_ID=$(cat /run/secrets/GUILD_ID) \
-    BOT_TOKEN=$(cat /run/secrets/BOT_TOKEN) \
-    && pip install poetry \
+RUN pip install poetry \
     && poetry config virtualenvs.create false \
     && poetry install --no-dev
 
 # Copy the rest of the application code
 COPY . .
 
-# Run the bot
-CMD ["poetry", "run", "python", "src/main.py"]
+# Set environment variables during runtime
+CMD ["sh", "-c", \
+    "GUILD_ID=$(cat /run/secrets/GUILD_ID) && \
+    BOT_TOKEN=$(cat /run/secrets/BOT_TOKEN) && \
+    poetry run python src/main.py"]