[Feature:Autograding] add docker image for Python 3.10 (#61)

### What is the new behavior?

add docker image for python 3.10

---------

Co-authored-by: Barb Cutler <Barb Cutler>

Author: bmcutler

dockerfiles/clang/14/Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:22.04
 
-# installing requirements to get and extract prebuilt binaries
+# installing clang & clang++
 RUN apt-get update
 RUN apt-get install -y clang-14 lld-14
 RUN rm -rf /var/lib/apt/lists/*

dockerfiles/python/3.10/Dockerfile

@@ -0,0 +1,9 @@
+FROM ubuntu:22.04
+
+# installing python
+RUN apt-get update
+RUN apt-get install -y python3.10
+RUN rm -rf /var/lib/apt/lists/*
+
+# symlinks
+RUN ln -s /usr/bin/python3.10 /usr/bin/python3

dockerfiles/python/metadata.json

@@ -1,4 +1,4 @@
 {
     "pushLatest": true,
-    "latestTag": "3.7"
+    "latestTag": "3.10"
 }