Experiment on test-proxy

Try pointing `test-proxy` at a custom container image `fdev321123/ubuntu-with-git` (courtesy of @fhammerl)

.github/workflows/test.yml

@@ -190,7 +190,7 @@ jobs:
   test-proxy:
     runs-on: ubuntu-latest
     container:
-      image: ubuntu:latest
+      image: fdev321123/ubuntu-with-git:latest
       options: --dns 127.0.0.1
     services:
       squid-proxy:
@@ -200,10 +200,10 @@ jobs:
     env:
       https_proxy: http://squid-proxy:3128
     steps:
-      - name:  Install Git
-        run: |
-          apt-get update
-          apt-get install git
+      # - name:  Install Git
+      #   run: |
+      #     apt-get update
+      #     apt-get install git
           
       # Clone this repo
       - name: Checkout