fix: using code blocks within release-notes (#275)

Increase the number of code blocks backticks to 4 for the release note prefix and suffix, to allow users to embed their own code blocks using only 3 backticks.

internal/testdata/changelog-content.txt

@@ -0,0 +1,7 @@
+This is the changelog
+
+## Awesome
+
+### New
+
+#### Changes

internal/testdata/changelog.txt

@@ -0,0 +1,13 @@
+# Foobar
+
+<!-- section-start changelog -->
+This is the changelog
+
+## Awesome
+
+### New
+
+#### Changes
+<!-- section-end changelog -->
+
+Suffix Things

internal/testdata/description-no-overrides.txt

@@ -0,0 +1,28 @@
+<!-- section-start changelog -->
+## v1.0.0
+<!-- section-end changelog -->
+
+---
+
+<details>
+  <summary><h4>PR by <a href="https://github.com/apricote/releaser-pleaser">releaser-pleaser</a> 🤖</h4></summary>
+
+If you want to modify the proposed release, add you overrides here. You can learn more about the options in the docs.
+
+## Release Notes
+
+### Prefix / Start
+
+This will be added to the start of the release notes.
+
+~~~~rp-prefix
+~~~~
+
+### Suffix / End
+
+This will be added to the end of the release notes.
+
+~~~~rp-suffix
+~~~~
+
+</details>

internal/testdata/description-overrides.txt

@@ -0,0 +1,44 @@
+<!-- section-start changelog -->
+## v1.0.0
+<!-- section-end changelog -->
+
+---
+
+<details>
+  <summary><h4>PR by <a href="https://github.com/apricote/releaser-pleaser">releaser-pleaser</a> 🤖</h4></summary>
+
+If you want to modify the proposed release, add you overrides here. You can learn more about the options in the docs.
+
+## Release Notes
+
+### Prefix / Start
+
+This will be added to the start of the release notes.
+
+~~~~rp-prefix
+## Foo
+
+- Cool thing
+
+```go
+// Some code example
+func IsPositive(number int) error {
+	if number < 0 {
+		return fmt.Errorf("number %d is negative", number)
+	}
+	return nil
+}
+```
+~~~~
+
+### Suffix / End
+
+This will be added to the end of the release notes.
+
+~~~~rp-suffix
+## Compatibility
+
+No compatibility guarantees.
+~~~~
+
+</details>

internal/testdata/description-prefix.txt

@@ -0,0 +1,41 @@
+<!-- section-start changelog -->
+## v1.0.0
+<!-- section-end changelog -->
+
+---
+
+<details>
+  <summary><h4>PR by <a href="https://github.com/apricote/releaser-pleaser">releaser-pleaser</a> 🤖</h4></summary>
+
+If you want to modify the proposed release, add you overrides here. You can learn more about the options in the docs.
+
+## Release Notes
+
+### Prefix / Start
+
+This will be added to the start of the release notes.
+
+~~~~rp-prefix
+## Foo
+
+- Cool thing
+
+```go
+// Some code example
+func IsPositive(number int) error {
+	if number < 0 {
+		return fmt.Errorf("number %d is negative", number)
+	}
+	return nil
+}
+```
+~~~~
+
+### Suffix / End
+
+This will be added to the end of the release notes.
+
+~~~~rp-suffix
+~~~~
+
+</details>

internal/testdata/description-suffix.txt

@@ -0,0 +1,31 @@
+<!-- section-start changelog -->
+## v1.0.0
+<!-- section-end changelog -->
+
+---
+
+<details>
+  <summary><h4>PR by <a href="https://github.com/apricote/releaser-pleaser">releaser-pleaser</a> 🤖</h4></summary>
+
+If you want to modify the proposed release, add you overrides here. You can learn more about the options in the docs.
+
+## Release Notes
+
+### Prefix / Start
+
+This will be added to the start of the release notes.
+
+~~~~rp-prefix
+~~~~
+
+### Suffix / End
+
+This will be added to the end of the release notes.
+
+~~~~rp-suffix
+## Compatibility
+
+No compatibility guarantees.
+~~~~
+
+</details>

internal/testdata/prefix.txt

@@ -0,0 +1,13 @@
+## Foo
+
+- Cool thing
+
+```go
+// Some code example
+func IsPositive(number int) error {
+	if number < 0 {
+		return fmt.Errorf("number %d is negative", number)
+	}
+	return nil
+}
+```

internal/testdata/suffix.txt

@@ -0,0 +1,3 @@
+## Compatibility
+
+No compatibility guarantees.

internal/testdata/testdata.go

@@ -0,0 +1,19 @@
+package testdata
+
+import (
+	"embed"
+	"testing"
+)
+
+//go:embed *.txt
+var testdata embed.FS
+
+func MustReadFileString(t *testing.T, name string) string {
+	t.Helper()
+
+	content, err := testdata.ReadFile(name)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return string(content)
+}