adds workflow-dispatch + sets PACKER_ACC_BUILDERS for acceptance tests

.github/workflows/acceptance-test.yml

@@ -63,8 +63,7 @@ jobs:
         run: |
           mkdir -p /tmp/test-results
           make dev
-          ACC_TEST_BUILDERS="amazon-ebs" PACKER_ACC=1 gotestsum --format=short-verbose --junitfile 
-          /tmp/test-results/gotestsum-report.xml -- -timeout=120m -p 2 $(go list ./... | grep -v inspec | grep -v profitbricks | grep -v oneandone)
+          ACC_TEST_BUILDERS="amazon-ebs" PACKER_ACC=1 gotestsum --format=short-verbose --junitfile /tmp/test-results/gotestsum-report.xml -- -timeout=120m -p 2 $(go list ./... | grep -v inspec | grep -v profitbricks | grep -v oneandone)
   # Send a slack notification if either job defined above fails
   slack-notify:
     permissions: