fix(ci): disable docker jobs due to missing docker in gitea runner

Gitea Actions runner uses node:18-bullseye container which lacks Docker.
Disable docker jobs until runner is configured with Docker-in-Docker
or a container with Docker pre-installed.

.github/workflows/nightly.yml

@@ -14,6 +14,7 @@ jobs:
     name: Build Nightly Image
     runs-on: ubuntu-latest
     environment: nightly
+    if: false
 
     steps:
       - name: Checkout

.github/workflows/release.yml

@@ -58,7 +58,7 @@ jobs:
     name: Build & Push Docker Image
     runs-on: ubuntu-latest
     needs: release
-    if: needs.release.result == 'success'
+    if: false
 
     steps:
       - name: Checkout

.github/workflows/staging.yml

@@ -14,6 +14,7 @@ jobs:
     name: Build & Deploy to Staging
     runs-on: ubuntu-latest
     environment: staging
+    if: false
 
     steps:
       - name: Checkout