fix(ci): use ref input in checkout step for dlstreamer workflows

Author: arodage

.github/workflows/build-azl3-dlstreamer.yml

@@ -30,6 +30,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
+          ref: ${{ github.event.inputs.ref || github.ref }}
           persist-credentials: false
 
       - name: Set up Docker Buildx

.github/workflows/build-elxr12-dlstreamer.yml

@@ -30,6 +30,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
+          ref: ${{ github.event.inputs.ref || github.ref }}
           persist-credentials: false
 
       - name: Set up Docker Buildx

.github/workflows/build-emt3-dlstreamer.yml

@@ -30,6 +30,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
+          ref: ${{ github.event.inputs.ref || github.ref }}
           persist-credentials: false
 
       - name: Set up Docker Buildx

.github/workflows/build-ubuntu24-dlstreamer.yml

@@ -30,6 +30,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
         with:
+          ref: ${{ github.event.inputs.ref || github.ref }}
           persist-credentials: false
 
       - name: Set up Docker Buildx