Update mirror job (#83)

Signed-off-by: eduponz <eduardoponz@eprosima.com>

.github/workflows/mirror.yml

@@ -1,13 +1,12 @@
 # .github/workflows/mirror.yml
+name: Mirror
 on:
     push:
       branches:
         - 'master'
-        - '1.2.x'
 
 jobs:
-  mirror_job_master:
-    if: github.ref == 'refs/heads/master'
+  mirror_job:
     runs-on: ubuntu-latest
     name: Mirror master branch to API & ABI compatible minor version branches
     strategy:
@@ -24,21 +23,3 @@ jobs:
         github-token: ${{ secrets.GITHUB_TOKEN }}
         source: 'master'
         dest: ${{ matrix.dest_branch }}
-
-  mirror_job_1_x:
-      if: github.ref == 'refs/heads/1.2.x'
-      runs-on: ubuntu-latest
-      name: Mirror 1.2.x branch to compatible version branches
-      strategy:
-        fail-fast: false
-        matrix:
-          dest_branch:
-            - '1.x'
-      steps:
-      - name: Mirror action step
-        id: mirror
-        uses: eProsima/eProsima-CI/external/mirror-branch-action@v0
-        with:
-          github-token: ${{ secrets.GITHUB_TOKEN }}
-          source: '1.x'
-          dest: ${{ matrix.dest_branch }}