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examples/ota: fix README for instructions on hosting image on github.com server

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Ref: https://esp32.com/viewtopic.php?f=13&t=26076
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Mahavir Jain 2022-02-13 20:36:07 +05:30
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examples/system/ota/README.md
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@ -158,4 +158,17 @@ $ python example_test.py build 8070
Starting HTTPS server at "https://:8070"
192.168.10.106 - - [02/Mar/2021 14:32:26] "GET /simple_ota.bin HTTP/1.1" 200 -
```
* Publish the firmware image on a public server (e.g. github.com) and copy its root certificate to the `server_certs` directory as `ca_cert.pem`. (The certificate can be downloaded using the `s_client` openssl command if the host includes the root certificate in the chain, e.g. `openssl s_client -showcerts -connect github.com:443 </dev/null`)
* Publish the firmware image on a public server (e.g. github.com) and copy its root certificate to the `server_certs` directory as `ca_cert.pem`. The certificate can be downloaded using the `s_client` openssl command as shown below:
```
echo "" | openssl s_client -showcerts -connect raw.githubusercontent.com:443 | sed -n "1,/Root/d; /BEGIN/,/END/p" | openssl x509 -outform PEM >ca_cert.pem
```
Please note that URL used here is `raw.githubusercontent.com`. This URL allows raw access to files hosted on github.com repository. Additionally, command above copies last certificate from chain of certs as the CA root cert of server.
---
**NOTE**
For examples using certificate bundle approach (e.g., `simple_ota_example`), it already has most common root certificates and hence there is no need to add any additional certs.
---