Task: Push and update files in GitHub

n8n workflow:
{"id":"kdqqvoh5qZaYawq1","meta":{"instanceId":"fb924c73af8f703905bc09c9ee8076f48c17b596ed05b18c0ff86915ef8a7c4a"},"name":"Work with GitHub | examples","tags":[{"id":"y9tvM3hISJKT2jeo","name":"Ted's Tech Talks","createdAt":"2023-08-15T22:12:34.260Z","updatedAt":"2023-08-15T22:12:34.260Z"}],"nodes":[{"id":"b3f0b4a9-34ea-4630-8756-eb43f8ecb4ff","name":"When clicking \"Execute Workflow\"","type":"n8n-nodes-base.manualTrigger","position":[220,640],"parameters":{},"typeVersion":1},{"id":"f5cb92f3-c3df-4640-90c1-870c9f27d085","name":"Sticky Note","type":"n8n-nodes-base.stickyNote","position":[830,402],"parameters":{"width":865.0290253216738,"height":244.559082047148,"content":"## Push a single file via GitHub node directly to the remote GitHub repo"},"typeVersion":1},{"id":"54f7a07c-8d85-4c69-81c9-a95449958eb4","name":"GitHub push edited file","type":"n8n-nodes-base.github","position":[1200,480],"parameters":{"owner":{"__rl":true,"mode":"list","value":"teds-tech-talks","cachedResultUrl":"https://github.com/teds-tech-talks","cachedResultName":"teds-tech-talks"},"filePath":"README.md","resource":"file","operation":"edit","repository":{"__rl":true,"mode":"list","value":"git_push_article","cachedResultUrl":"https://github.com/teds-tech-talks/git_push_article","cachedResultName":"git_push_article"},"fileContent":"={{ $json.data }}\n## Updated at:\n{{ $now.toISO() }}","commitMessage":"updated from n8n via GitHub node","authentication":"oAuth2"},"credentials":{"githubOAuth2Api":{"id":"SBUgEkMg70oFZRct","name":"TTT GitHub account"}},"typeVersion":1},{"id":"2b625156-17a5-4245-9ee8-604a631d65fe","name":"Update README and add new file","type":"n8n-nodes-base.executeCommand","position":[1040,800],"parameters":{"command":"=echo '' >> {{ $('config').item.json.localrepo }}/README.md\necho '## Updated at:' >> {{ $('config').item.json.localrepo }}/README.md\necho '{{ $now.toISO() }}' >> {{ $('config').item.json.localrepo }}/README.md\necho 'Check new file' >> {{ $('config').item.json.localrepo }}/README.md\necho '' >> {{ $('config').item.json.localrepo }}/README.md\n\necho '# This is a new file' >> {{ $('config').item.json.localrepo }}/new_{{ $now.toFormat('yyyyddMM-hhmmss') }}.md"},"typeVersion":1},{"id":"99bf3b00-7e51-49b6-a602-8769012d9270","name":"Add files","type":"n8n-nodes-base.git","position":[1200,800],"parameters":{"operation":"add","pathsToAdd":".","repositoryPath":"={{ $('config').item.json.localrepo }}"},"typeVersion":1},{"id":"f0e220c5-d717-471f-8b0c-cca3a06ff7f6","name":"Commit","type":"n8n-nodes-base.git","position":[1360,800],"parameters":{"message":"updated from n8n via Git node","options":{},"operation":"commit","repositoryPath":"={{ $('config').item.json.localrepo }}"},"typeVersion":1},{"id":"7ef8674e-3c1f-4903-aa3e-28af69d80264","name":"Push","type":"n8n-nodes-base.git","position":[1520,800],"parameters":{"options":{"targetRepository":"https://github.com/teds-tech-talks/git_push_article.git"},"operation":"push","authentication":"gitPassword","repositoryPath":"={{ $('config').item.json.localrepo }}"},"credentials":{"gitPassword":{"id":"CQx0W73u1zlK56mk","name":"TTT Git account"}},"typeVersion":1},{"id":"f27bb600-4352-47db-aeeb-7688fa6c72c1","name":"config","type":"n8n-nodes-base.set","position":[520,640],"parameters":{"values":{"string":[{"name":"localrepo","value":"/path/to/git/repo"}]},"options":{}},"typeVersion":2},{"id":"512f0333-358d-43e6-a03f-b13792969d04","name":"Pull","type":"n8n-nodes-base.git","position":[880,800],"parameters":{"operation":"pull","repositoryPath":"={{ $('config').item.json.localrepo }}"},"typeVersion":1},{"id":"2830b321-5b58-4080-9a53-ddc703a80ec9","name":"Sticky 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file","type":"n8n-nodes-base.code","position":[1040,480],"parameters":{"jsCode":"var text = Buffer.from($input.first().binary.data.data, 'base64').toString('utf8');\nreturn {\"data\": text};"},"typeVersion":2},{"id":"ec27d375-b994-415c-be53-5715df83585c","name":"Sticky Note2","type":"n8n-nodes-base.stickyNote","position":[400.9808509052974,440],"parameters":{"width":373.9894195663518,"height":383.3156992772523,"content":"## Please update the path to the local repository and connect this node to the upper or lower parts of the workflow"},"typeVersion":1}],"active":false,"pinData":{},"settings":{"executionOrder":"v1"},"versionId":"4bf99f5b-96e7-4f12-a14d-187a0b39a07e","connections":{"Pull":{"main":[[{"node":"Update README and add new file","type":"main","index":0}]]},"Commit":{"main":[[{"node":"Push","type":"main","index":0}]]},"Add files":{"main":[[{"node":"Commit","type":"main","index":0}]]},"Decode file":{"main":[[{"node":"GitHub push edited file","type":"main","index":0}]]},"GitHub get file":{"main":[[{"node":"Decode file","type":"main","index":0}]]},"Update README and add new file":{"main":[[{"node":"Add files","type":"main","index":0}]]},"When clicking \"Execute Workflow\"":{"main":[[{"node":"config","type":"main","index":0}]]}}}