Add new pre-commit hook for packer formatting (#55)

## Description

This PR adds a new pre-commit hook for formatting packer HCL files. It also adds new test files for this hook.

## Verification steps

- [x] Run `make test` and verify tests pass

Author: daltonclaybrook

Dockerfile

@@ -102,6 +102,10 @@ chmod +x taplo
 wget https://releases.hashicorp.com/terraform/1.9.8/terraform_1.9.8_linux_amd64.zip -O tf.zip
 unzip tf.zip
 rm tf.zip
+rm LICENSE.txt
+wget https://releases.hashicorp.com/packer/1.14.2/packer_1.14.2_linux_amd64.zip -O packer.zip
+unzip packer.zip
+rm packer.zip
 
 # Create an empty file for the linters that need one for some reason
 touch /emptyfile

README.md

@@ -20,6 +20,7 @@ The main hook that runs several code formatters in parallel:
 - [shfmt](https://github.com/mvdan/sh) v3.10.0 for Shell
 - [xsltproc](http://www.xmlsoft.org/xslt/xsltproc.html) from libxslt v10139 for XML
 - [terraform fmt](https://github.com/hashicorp/terraform) v1.9.8 for Terraform
+- [packer fmt](https://github.com/hashicorp/packer) v1.14.2 for Packer
 - [ClangFormat](https://clang.llvm.org/docs/ClangFormat.html) v18.1.8 for C++, Protobuf
 - [SVGO](https://github.com/svg/svgo) v3.3.2 for SVG
 - [Taplo](https://taplo.tamasfe.dev/) v0.9.3 for TOML

entry.ts

@@ -86,6 +86,7 @@ const enum HookName {
   GradleDependenciesSorter = "gradle-dependencies-sorter",
   Isort = "isort",
   Ktfmt = "ktfmt",
+  PackerFmt = "packer fmt",
   PrettierJs = "Prettier (JS)",
   PrettierNonJs = "Prettier (non-JS)",
   Ruff = "Ruff",
@@ -261,6 +262,11 @@ const HOOKS: Record<HookName, LockableHook> = {
     include: /\.kts?$/,
     runAfter: [HookName.Sed],
   }),
+  [HookName.PackerFmt]: createLockableHook({
+    action: sources => run("/packer", "fmt", ...sources),
+    include: /\.pkr\.hcl$/,
+    runAfter: [HookName.Sed],
+  }),
   [HookName.PrettierJs]: createLockableHook({
     action: sources =>
       run(

test/after/hello.pkr.hcl

@@ -0,0 +1,9 @@
+build {
+  provisioner "shell" {
+    env = {
+      PATH        = local.shell_path
+      HELLO_WORLD = var.hello_world
+    }
+    script = "scripts/hello-world.sh"
+  }
+}

test/before/hello.pkr.hcl

@@ -0,0 +1,9 @@
+build {
+provisioner "shell" {
+env = {
+PATH = local.shell_path
+HELLO_WORLD = var.hello_world
+}
+script = "scripts/hello-world.sh"
+}
+}