show the bot public key pem on the bot view page

Java/Spring/activitypubbot/src/main/java/dev/activitypub/activitypubbot/Bot.java

@@ -43,7 +43,7 @@ public class Bot {
      * ActivityPub key JSON.
      * "-----BEGIN PUBLIC KEY-----\\nMI [...] AB\\n-----END PUBLIC KEY-----"
      */
-    String getPublicKeyPEMString() {
+    public String getPublicKeyPEMString() {
         // Note: for performance it could be worth storing this in the db, or caching it in some way
         PublicKey pk = keyPair.getPublic();
         StringWriter w = new StringWriter();

Java/Spring/activitypubbot/src/main/resources/templates/viewbot.html

@@ -21,6 +21,7 @@
     <span>Description:</span><span th:text="${bot.summary}"></span><br/>
     <span>Published:</span><span th:text="${bot.published}"></span><br/>
     <span>Type:</span><span th:text="${bot.type}"></span><br/>
+    <span>Public Key:</span><pre th:text="${bot.getPublicKeyPEMString()}"></pre><br/>
     <br>
     <a href="/">HOME</a> |
     <a href="/viewbot">Bot List</a>