chore: fix numbers in package templates (#2076)

## Description

Fix issues where the template regex does not match that of constants and
variables.

## Related Issue

Fixes #2074

## Type of change

- [X] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [X] Test, docs, adr added or updated as needed
- [X] [Contributor Guide
Steps](https://github.com/defenseunicorns/zarf/blob/main/CONTRIBUTING.md#developer-workflow)
followed

.github/workflows/test-external.yml

@@ -34,6 +34,9 @@ jobs:
 
       - name: Build binary and zarf packages
         uses: ./.github/actions/packages
+        with:
+          init-package: "false"
+          build-examples: "false"
 
       - name: Setup k3d
         uses: ./.github/actions/k3d

src/pkg/utils/yaml.go

@@ -178,7 +178,7 @@ func FindYamlTemplates(config any, prefix string, suffix string) (map[string]str
 	}
 
 	// Find all strings that are between the given prefix and suffix
-	r := regexp.MustCompile(fmt.Sprintf("%s([A-Z_]+)%s", prefix, suffix))
+	r := regexp.MustCompile(fmt.Sprintf("%s([A-Z0-9_]+)%s", prefix, suffix))
 	matches := r.FindAllStringSubmatch(string(text), -1)
 
 	for _, match := range matches {

src/test/e2e/24_variables_test.go

@@ -28,11 +28,13 @@ func TestVariables(t *testing.T) {
 	e2e.CleanFiles(tfPath, evilPath)
 
 	// Test that specifying an invalid setVariable value results in an error
-	stdOut, stdErr, err := e2e.Zarf("package", "create", evilSrc, "--confirm")
+	stdOut, stdErr, err := e2e.Zarf("package", "create", evilSrc, "--set", "NUMB3R5=K1TT3H", "--confirm")
 	require.NoError(t, err, stdOut, stdErr)
+	expectedOutString := "\"K1TT3H\""
+	require.Contains(t, stdErr, "", expectedOutString)
 	stdOut, stdErr, err = e2e.Zarf("package", "deploy", evilPath, "--confirm")
 	require.Error(t, err, stdOut, stdErr)
-	expectedOutString := "variable \"HELLO_KITTEH\" does not match pattern "
+	expectedOutString = "variable \"HELLO_KITTEH\" does not match pattern "
 	require.Contains(t, stdErr, "", expectedOutString)
 
 	// Test that specifying an invalid constant value results in an error

src/test/packages/24-evil-variables/zarf.yaml

@@ -5,6 +5,7 @@ metadata:
 
 components:
   - name: bad-set-variables-pattern
+    description: "###ZARF_PKG_TMPL_NUMB3R5###"
     required: true
     actions:
       onDeploy: