chore(scripts): auto create autoversion PR from release script (#13074)

Ref #12465

scripts/release/main.go

@@ -381,12 +381,18 @@ func (r *releaseCommand) autoversionFile(ctx context.Context, file, channel, ver
 			}
 		}
 		if matchRe != nil {
-			// Apply matchRe and find the group named "version", then replace it with the new version.
-			// Utilize the index where the match was found to replace the correct part. The only
-			// match group is the version.
+			// Apply matchRe and find the group named "version", then replace it
+			// with the new version.
 			if match := matchRe.FindStringSubmatchIndex(line); match != nil {
-				logger.Info(ctx, "updating version number", "line_number", i+1, "match", match)
-				lines[i] = line[:match[2]] + version + line[match[3]:]
+				vg := matchRe.SubexpIndex("version")
+				if vg == -1 {
+					logger.Error(ctx, "version group not found in match", "num_subexp", matchRe.NumSubexp(), "subexp_names", matchRe.SubexpNames(), "match", match)
+					return xerrors.Errorf("bug: version group not found in match")
+				}
+				start := match[vg*2]
+				end := match[vg*2+1]
+				logger.Info(ctx, "updating version number", "line_number", i+1, "match_start", start, "match_end", end, "old_version", line[start:end])
+				lines[i] = line[:start] + version + line[end:]
 				matchRe = nil
 				break
 			}

scripts/release/tag_version.sh

@@ -191,7 +191,7 @@ fi
 
 # Ensure the ref is in the release branch.
 branch_contains_ref=$(git branch --contains "${ref}" --list "${release_branch}" --format='%(refname)')
-if [[ -z $branch_contains_ref ]]; then
+if ((!dry_run)) && [[ -z $branch_contains_ref ]]; then
 	error "Provided ref (${ref_name}) is not in the required release branch (${release_branch})."
 fi
 

scripts/release/testdata/autoversion/docs/random.md

@@ -0,0 +1,14 @@
+# Some documentation
+
+1. Run the following command to install the chart in your cluster.
+
+   For the **mainline** Coder release:
+
+   <!-- autoversion(mainline): "--version [version] # trailing comment!" -->
+
+   ```shell
+   helm install coder coder-v2/coder \
+       --namespace coder \
+       --values values.yaml \
+       --version 2.10.0 # trailing comment!
+   ```

scripts/release/testdata/autoversion/docs/random.md.golden

@@ -0,0 +1,14 @@
+# Some documentation
+
+1. Run the following command to install the chart in your cluster.
+
+   For the **mainline** Coder release:
+
+   <!-- autoversion(mainline): "--version [version] # trailing comment!" -->
+
+   ```shell
+   helm install coder coder-v2/coder \
+       --namespace coder \
+       --values values.yaml \
+       --version 2.11.1 # trailing comment!
+   ```