workflow cleanup: removed trigger from side branch

Author: fl-matic-rupnik

.github/workflows/release-bitcoind.yml

@@ -1,7 +1,7 @@
 name: Release bitcoind image
 on:
   push:
-    branches: [main, "mr/optimization"]
+    branches: [main]
     tags: ["*"]
     paths: ["images/bitcoind/**"]
   pull_request:

.github/workflows/release-dogecoind.yml

@@ -1,7 +1,7 @@
 name: Release dogecoind image
 on:
   push:
-    branches: [main, "mr/optimization"]
+    branches: [main]
     tags: ["*"]
     paths: ["images/dogecoind/**"]
   pull_request:

.github/workflows/release-rippled.yml

@@ -1,7 +1,7 @@
 name: Release rippled image
 on:
   push:
-    branches: [main, "mr/optimization"]
+    branches: [main]
     tags: ["*"]
     paths: ["images/rippled/**"]
   pull_request: