ci: hotfix, update forgotten requirement.txt path in Dockerfile

docker/Dockerfile

@@ -56,7 +56,7 @@ ENV LANG='en_US.UTF-8' LANGUAGE='en_US:en' LC_ALL='en_US.UTF-8'
 ##############################################
 
 # Create conda environment and install requirements
-COPY requirements.txt .
+COPY docker/requirements.txt .
 ENV ENV_NAME=${PROJECT_NAME}
 RUN ${CONDA} create -y -n ${ENV_NAME} python=3.9
 RUN ${CONDA} run --name ${ENV_NAME} pip install -r requirements.txt