Add debugging cardano-cli on testnet instructions (#22)

* Add debugging cardano-cli on testnet instructions

* Fix broken link in plutus-spending-script-example.md

* Minor edits

---------

Co-authored-by: Damian Nadales <[email protected]>
Co-authored-by: olgahryniuk <[email protected]>

Author: 3 people

docs/Debugging-cardano-cli-errors-on-a-testnet.md

@@ -0,0 +1,61 @@
+# Debugging cardano-cli errors on testnet
+
+This document is intended for Cardano node and `cardano-cli` (CLI) users, as well as Cardano developers that wish to investigate CLI problems.
+
+We recommend making sure the `cardano-node` tests pass before starting to debug a problem. Additionally, take a look at the [Consensus sanity checklist](https://input-output-hk.github.io/ouroboros-consensus/docs/for-developers/SanityChecks).
+
+Once the node tests successfully pass, and you've read through the Consensus checklist, collect node logs to speed up the process of finding the cause of a problem. Below, we describe the steps to run a node that connects to a given testnet and get access to a `cardano-cli` that can be used to communicate with the node. These instructions work on a Unix environment with `nix` installed.
+
+Clone [cardano-world](https://github.com/input-output-hk/cardano-world) and check out the testnet branch (eg `sanchonet`).
+
+Once inside the `cardano-world` directory, enter a `nix` shell which has `cardano-node` in its path:
+
+```sh
+nix shell github:input-output-hk/cardano-node\?ref=8.1.1\#cardano-node
+```
+
+where `8.1.1` should be replaced with the version intended to be tested. Once inside the `nix` shell, we can check whether the `cardano-node` executable is in our `PATH`:
+
+```sh
+which cardano-node
+```
+
+```text
+/nix/store/scmkvbvx1355nwmclmrfd2snwvsgsn30-cardano-node-exe-cardano-node-8.1.1/bin/cardano-node
+```
+
+The configuration files for the node can be found inside the `docs/environment/testnet_name`. You can copy these files to a new directory to edit them and have the node use the configuration inside said directory. For instance, after we copy the configuration files to a director named `node-custom-config`, the node can be readily run:
+
+```sh
+ cardano-node run \
+  --config node-custom-config/config.json \
+  --database-path my-node-db \
+  --socket-path node.socket \
+  --topology custom-node-config/topology.json | tee -a node.log
+```
+
+In particular, make sure to enable the relevant tracers in the node configuration file. In the example above this file is `node-custom-config/config.json`.
+
+Once the node is running, we need a CLI to communicate with it. To enter a shell that has `cardano-cli` in its `PATH` you can run:
+
+```sh
+nix develop .#x86_64-linux.automation.devshells.dev
+which cardano-cli
+```
+
+```text
+/nix/store/cbr6kgfsq7pqjwdirvm75lwzaibxvyfm-devshell-dir/bin/cardano-cli
+```
+
+## Debugging options
+
+It might be a good idea to adjust the `mapSeverity` attribute for the `LocalTxSubmissionProtocol` to `Debug` in the node configuration file.
+
+```json
+...
+    "mapSeverity": {
+      "cardano.node.LocalTxSubmissionProtocol": "Debug"
+    }
+...
+
+```

docs/reference/plutus/plutus-spending-script-example.md

@@ -115,5 +115,5 @@ cardano-cli transaction sign \
 
 If there is ADA at `$dummyaddress` then the Plutus script was successfully executed.
 
-You can use the [example-txin-locking-plutus-script.sh](https://github.com/input-output-hk/cardano-node/blob/master/scripts/plutus/example-txin-locking-plutus-script.sh) in conjunction with [mkfiles.sh alonzo](https://github.com/input-output-hk/cardano-node/blob/master/scripts/scripts/byron-to-alonzo/mkfiles.sh) script to automagically run the `AlwaysSucceeds` script.
+You can use the [example-txin-locking-plutus-script.sh](https://github.com/input-output-hk/cardano-node/blob/master/scripts/plutus/example-txin-locking-plutus-script.sh) in conjunction with [mkfiles.sh alonzo](https://github.com/input-output-hk/cardano-node/blob/master/scripts/byron-to-alonzo/mkfiles.sh) script to automagically run the `AlwaysSucceeds` script.