Add support for partial checkout filters (#1396)

* added filter option & tests

* added build file

* fix test oversight

* added exit 1

* updated docs to specify override

* undo unneeded readme change

* set to undefined rather than empty string

* run git config in correct di

---------

Co-authored-by: Cory Miller <13227161+cory-miller@users.noreply.github.com>

__test__/git-auth-helper.test.ts

@@ -802,6 +802,7 @@ async function setup(testName: string): Promise<void> {
     authToken: 'some auth token',
     clean: true,
     commit: '',
+    filter: undefined,
     sparseCheckout: [],
     sparseCheckoutConeMode: true,
     fetchDepth: 1,

__test__/input-helper.test.ts

@@ -79,6 +79,7 @@ describe('input-helper tests', () => {
     expect(settings.clean).toBe(true)
     expect(settings.commit).toBeTruthy()
     expect(settings.commit).toBe('1234567890123456789012345678901234567890')
+    expect(settings.filter).toBe(undefined)
     expect(settings.sparseCheckout).toBe(undefined)
     expect(settings.sparseCheckoutConeMode).toBe(true)
     expect(settings.fetchDepth).toBe(1)

__test__/verify-fetch-filter.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# Verify .git folder
+if [ ! -d "./fetch-filter/.git" ]; then
+  echo "Expected ./fetch-filter/.git folder to exist"
+  exit 1
+fi
+
+# Verify .git/config contains partialclonefilter
+
+CLONE_FILTER=$(git -C fetch-filter config --local --get remote.origin.partialclonefilter)
+
+if [ "$CLONE_FILTER" != "blob:none" ]; then
+  echo "Expected ./fetch-filter/.git/config to have 'remote.origin.partialclonefilter' set to 'blob:none'"
+  exit 1
+fi