[misc] add forum post and update sign pipeline (#4155)

use old git-town version

.github/workflows/git-town.yml

@@ -16,6 +16,6 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: git-town/action@v1
+      - uses: git-town/action@v1.2.1
         with:
-          skip-single-stacks: true
+          skip-single-stacks: true

.github/workflows/release.yml

@@ -9,7 +9,7 @@ on:
   pull_request:
 
 env:
-  SIGN_PIPE_VER: "v0.0.20"
+  SIGN_PIPE_VER: "v0.0.21"
   GORELEASER_VER: "v2.3.2"
   PRODUCT_NAME: "NetBird"
   COPYRIGHT: "NetBird GmbH"
@@ -231,3 +231,17 @@ jobs:
           ref: ${{ env.SIGN_PIPE_VER }}
           token: ${{ secrets.SIGN_GITHUB_TOKEN }}
           inputs: '{ "tag": "${{ github.ref }}", "skipRelease": false }'
+
+  post_on_forum:
+    runs-on: ubuntu-latest
+    continue-on-error: true
+    needs: [trigger_signer]
+    steps:
+      - uses: Codixer/discourse-topic-github-release-action@v2.0.1
+        with:
+          discourse-api-key: ${{ secrets.DISCOURSE_RELEASES_API_KEY }}
+          discourse-base-url: https://forum.netbird.io
+          discourse-author-username: NetBird
+          discourse-category: 17
+          discourse-tags:
+            releases