[MM-43920] - Set Workspace Inactivity Email to only fire once and change subject (#20134)

* [MM-43920] - Set Workspace Inactivity Email to only fire once and change subject

* feedback impl

* temp change

* revert

Co-authored-by: Mattermod <mattermod@users.noreply.github.com>

app/email/email.go

@@ -11,6 +11,8 @@ import (
 	"io"
 	"net/http"
 	"net/url"
+	"os"
+	"strconv"
 	"strings"
 	"time"
 
@@ -24,6 +26,8 @@ import (
 	"github.com/microcosm-cc/bluemonday"
 )
 
+const serverInactivityHours = 100
+
 func (es *Service) SendChangeUsernameEmail(newUsername, email, locale, siteURL string) error {
 	T := i18n.GetUserTranslations(locale)
 
@@ -944,6 +948,15 @@ func (es *Service) SendLicenseInactivityEmail(email, name, locale, siteURL strin
 	data.Props["Playbooks"] = T("Playbooks")
 	data.Props["Boards"] = T("Boards")
 
+	inactivityDurationHoursEnv := os.Getenv("MM_INACTIVITY_DURATION")
+	inactivityDurationHours, parseError := strconv.ParseFloat(inactivityDurationHoursEnv, 64)
+	if parseError != nil {
+		// default to 100 hours
+		inactivityDurationHours = serverInactivityHours
+	}
+
+	data.Props["FooterDisclaimer"] = T("api.templates.server_inactivity_footer_disclaimer", map[string]interface{}{"Hours": inactivityDurationHours})
+
 	body, err := es.templatesContainer.RenderToString("inactivity_body", data)
 	if err != nil {
 		return err