Bug: fails on selfhosted github runner because it takes / as working dir

[Elyytscha]

I'm not sure if this is an issue in general or only with selfhosted github runner, but we had the following issue:

Run quizlet/argocd-diff-action@master
Fetching apps from: https://argocd.example.com/api/v[1](https://github.com/<redacted>#step:3:1)/applications
Changed files: .github/workflows/argo-diff.yaml, base/operators/kustomization.yaml, base/operators/mongodb-atlas/kustomization.yaml, base/operators/mongodb-atlas/operator-group.yaml, base/operators/mongodb-atlas/operator-ns.yaml, base/operators/mongodb-atlas/subscription.yaml, customer/infra/operators/kustomization.yaml
Found apps: operators
Running: argocd app diff operators --local=./customer/infra/operators
stdout: 
stderr: Warning: local diff without --server-side-generate is deprecated and does not work with plugins. Server-side generation will be the default in v2.7.time="2024-09-30T[12](https://github.com/<redacted>#step:3:13):24:02Z" level=info msg="kustomize build ./customer/infra/operators --enable-helm --load-restrictor=LoadRestrictionsNone" dir=/ execID=6eeb0
time="2024-09-30T12:24:02Z" level=error msg="`kustomize build ./customer/infra/operators --enable-helm --load-restrictor=LoadRestrictionsNone` failed exit status 1: Error: must build at directory: not a valid directory: evalsymlink failure on './customer/infra/operators' : lstat /customer: no such file or directory" execID=6eeb0
time="2024-09-30T12:24:02Z" level=info msg=Trace args="[kustomize build ./customer/infra/operators --enable-helm --load-restrictor=LoadRestrictionsNone]" dir=/ operation_name="exec kustomize" time_ms=7.63694
time="2024-09-30T12:24:02Z" level=fatal msg="`kustomize build ./customer/infra/operators --enable-helm --load-restrictor=LoadRestrictionsNone` failed exit status 1: Error: must build at directory: not a valid directory: evalsymlink failure on './customer/infra/operators' : lstat /customer: no such file or directory"

what fixed it for us

argocd-diff-action/src/main.ts

Line 279 in 2a813f4

const command = `app diff ${app.metadata.name} --local-repo-root=${process.cwd()} --local=${app.spec.source.path}`;

--local-repo-root=${process.cwd()} 

pr: #53