chore: simplify workflows (#3902)

## About the changes
This PR removes one workflow file and merges it into a similar workflow
file, these are the differences:

![image](https://github.com/Unleash/unleash/assets/455064/8afa791e-5f78-45cb-baca-1c28d4559d51)


This should help improving maintainability of the workflows

.github/workflows/docker_publish.yaml

@@ -1,9 +1,11 @@
-name: Publish main branch to dockerhub
+name: Publish to dockerhub
 
 on:
   push:
     branches:
       - main
+    tags:
+      - 'v*'
 
 jobs:
   build:
@@ -25,7 +27,12 @@ jobs:
           images: |
             unleashorg/unleash-server
           tags: |
-            type=edge,prefix=main-,suffix=-${{ matrix.version }}
+            # only enabled for v* tags:
+            type=semver,pattern={{ version }},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+            type=semver,pattern={{ major.minor }},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+            type=semver,pattern={{ major }},enable=${{ startsWith(github.ref, 'refs/tags/v') }}
+            # only enabled in main:
+            type=edge,prefix=main-,suffix=-${{ matrix.version }},enable=${{ github.ref == 'refs/heads/main' }}
       - name: Login to docker hub
         uses: docker/login-action@v2
         with:

.github/workflows/docker_publish_tags.yaml

@@ -1,40 +0,0 @@
-name: Push Tags
-
-on:
-  push:
-    tags:
-      - 'v*'
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Checkout
-        uses: actions/checkout@v3
-      - name: Setup QEmu so we can build multiplatform
-        uses: docker/setup-qemu-action@v2
-      - name: Setup Docker buildx
-        uses: docker/setup-buildx-action@v2
-      - name: Docker meta configuration
-        uses: docker/metadata-action@v3
-        id: meta
-        with:
-          images: |
-            unleashorg/unleash-server
-          tags: |
-            type=semver,pattern={{ version }}
-            type=semver,pattern={{ major.minor }}
-            type=semver,pattern={{ major }}
-      - name: Login to docker hub
-        uses: docker/login-action@v2
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-      - name: Build tag and push image to Docker hub
-        uses: docker/build-push-action@v3
-        with:
-          platforms: linux/amd64,linux/arm64
-          push: true
-          tags: ${{ steps.meta.outputs.tags }}
-          labels: ${{ steps.meta.outputs.labels }}
-          build-args: NODE_VERSION=18-alpine