adding proxy settings to git-clone

Adding httpsProxy, httpProxy, and noProxy in git-clone task.

git/README.md

@@ -38,6 +38,9 @@ as well as
 * **sslVerify**: defines if http.sslVerify should be set to true or false in the global git config (_default_: true)
 * **subdirectory**: subdirectory inside the "output" workspace to clone the git repo into (_default:_ src)
 * **deleteExisting**: clean out the contents of the repo's destination directory if it already exists before cloning the repo there (_default_: false)
+* **httpProxy**: git HTTP proxy server for non-SSL requests
+* **httpsProxy**: git HTTPS proxy server for SSL requests
+* **noProxy**: git no proxy - opt out of proxying HTTP/HTTPS requests
 
 ### Results
 

git/git-clone.yaml

@@ -35,6 +35,18 @@ spec:
       description: clean out the contents of the repo's destination directory (if it already exists) before trying to clone the repo there
       type: string
       default: "false"
+    - name: httpProxy
+      description: git HTTP proxy server for non-SSL requests
+      type: string
+      default: ""
+    - name: httpsProxy
+      description: git HTTPS proxy server for SSL requests
+      type: string
+      default: ""
+    - name: noProxy
+      description: git no proxy - opt out of proxying HTTP/HTTPS requests
+      type: string
+      default: ""
   results:
   - name: commit
     description: The precise commit SHA that was fetched by this Task
@@ -63,6 +75,10 @@ spec:
         cleandir
       fi
 
+      test -z "$(inputs.params.httpProxy)" || export HTTP_PROXY=$(inputs.params.httpProxy)
+      test -z "$(inputs.params.httpsProxy)" || export HTTPS_PROXY=$(inputs.params.httpsProxy)
+      test -z "$(inputs.params.noProxy)" || export NO_PROXY=$(inputs.params.noProxy)
+
       /ko-app/git-init \
         -url "$(inputs.params.url)" \
         -revision "$(inputs.params.revision)" \