Update Dockerfile #212

Job	Run time
🏗️ Docker image	10m 17s
🔍 Python Lint (3.8)	4m 26s
🔍 Python Lint (3.9)	4m 37s
🧪 Python integration tests (3.8, pyserini)	11m 36s
🔍 Python code format (3.8)	3m 52s
🧪 Python integration tests (3.8, pyterrier)	5m 21s
🔍 Python code format (3.9)	5m 4s
🔍 Python Lint backend (3.8, pyserini)	11m 2s
🧪 Python integration tests (3.9, pyserini)	5m 58s
🔍 Python Lint backend (3.8, pyterrier)	4m 55s
🧪 Python unit tests (3.8)	4m 36s
🧪 Python integration tests (3.9, pyterrier)	4m 57s
🔍 Python Lint backend (3.9, pyserini)	4m 41s
🧪 Python unit tests (3.9)	4m 59s
🏗️ Python wheel (3.8)	17s
🔍 Python Lint backend (3.9, pyterrier)	4m 21s
🏗️ Python wheel (3.9)	19s
🚀 Create GitHub release	0s
🚀 Publish Docker image	0s
🚀 Publish Python wheels	0s
	1h 31m 18s

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