feat(packer): add packer plugin

add some alias

plugins/packer/README.md

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+# Packer plugin
+
+Plugin for Packer, a tool from Hashicorp for managing docker safely and efficiently.
+It adds aliases for `packer`
+
+To use it, add `packer` to the plugins array of your `~/.zshrc` file:
+
+```shell
+plugins=(... packer)
+```
+
+## Requirements
+
+* [packer](https://packer.io/)
+
+## Aliases
+
+| Alias    | Command                                                                           |
+| -------- | --------------------------------------------------------------------------------- |
+| `pkr`    | `packer`                                                                          |
+| `pkri`   | `packer init .`                                                                   |
+| `pkrf`   | `packer fmt . -recursive`                                                         |
+| `pkrv`   | `packer validate .`                                                               |
+| `pkrb`   | `packer build .`                                                                  |
+| `pkrall` | `packer init . && packer fmt . -recursive && packer validate . && packer build .` |

plugins/packer/terraform.plugin.zsh

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+alias pkr='packer'
+alias pkri='packer init .'
+alias pkrf='packer fmt . -recursive'
+alias pkrv='packer validate .'
+alias pkrb='packer build .'
+alias pkrall='packer init . && packer fmt . -recursive && packer validate . && packer build .'