Support overriding the default template dir (#98)

* Support overriding the default template dir.
Useful for environments where the container workdir is overridden(like
GitHub Actions) or when custom templates are desired.

* Fix some issues with event.json handeling

cmd/telefonistka/event.go

@@ -45,13 +45,14 @@ func event(eventType string, eventFilePath string) {
 	// To use the same code path as for Webhook I'm creating an http request with the payload from the file.
 	// This might not be very smart.
 
-	h := http.Request{}
+	h, _ := http.NewRequest("POST", "", nil) //nolint:noctx
 	h.Body = io.NopCloser(bytes.NewReader(payload))
 	h.Header.Set("Content-Type", "application/json")
+	h.Header.Set("X-GitHub-Event", eventType)
 
 	mainGhClientCache, _ := lru.New[string, githubapi.GhClientPair](128)
 	prApproverGhClientCache, _ := lru.New[string, githubapi.GhClientPair](128)
-	githubapi.HandleEvent(&h, ctx, mainGhClientCache, prApproverGhClientCache, nil)
+	githubapi.HandleEvent(h, ctx, mainGhClientCache, prApproverGhClientCache, nil)
 }
 
 func getEnv(key, fallback string) string {

docs/installation.md

@@ -75,6 +75,8 @@ Environment variables for the webhook process:
 
 `GITHUB_APP_ID` Application ID for Github applications style of deployments, available in the Github Application setting page.
 
+`TEMPLATES_PATH` Telefonistka uses Go templates to format GitHub PR comments, the variable override the default templates path("templates/"), useful for environments where the container workdir is overridden(like GitHub Actions) or when custom templates are desired.
+
 Behavior of the bot is configured by YAML files **in the target repo**:
 
 ## Repo Configuration

internal/pkg/githubapi/github.go

@@ -247,7 +247,7 @@ func handleCommentPrEvent(ghPrClientDetails GhPrClientDetails, ce *github.IssueC
 
 func commentPlanInPR(ghPrClientDetails GhPrClientDetails, promotions map[string]PromotionInstance) {
 	var templateOutput bytes.Buffer
-	dryRunMsgTemplate, err := template.New("dryRunMsg").ParseFiles("templates/dry-run-pr-comment.gotmpl")
+	dryRunMsgTemplate, err := template.New("dryRunMsg").ParseFiles(getEnv("TEMPLATES_PATH", "templates/") + "dry-run-pr-comment.gotmpl")
 	if err != nil {
 		ghPrClientDetails.PrLogger.Errorf("Failed to parse template: err=%v", err)
 	}

internal/pkg/githubapi/promotion.go

@@ -74,7 +74,7 @@ func DetectDrift(ghPrClientDetails GhPrClientDetails) error {
 	}
 	if len(diffOutputMap) != 0 {
 		var templateOutput bytes.Buffer
-		driftMsgTemplate, err := template.New("driftMsg").ParseFiles("templates/drift-pr-comment.gotmpl")
+		driftMsgTemplate, err := template.New("driftMsg").ParseFiles(getEnv("TEMPLATES_PATH", "templates/") + "drift-pr-comment.gotmpl")
 		if err != nil {
 			ghPrClientDetails.PrLogger.Errorf("Failed to parse template: err=%v", err)
 			return err