GHA: correct the install-pr.yml

    - GITHUB_ENV cannot be used cross jobs
    - correct the GITHUB_ENV setup with multiple lines file

Signed-off-by: Vicente Cheng <[email protected]>
(cherry picked from commit 9e02379)

.github/workflows/installer-pr.yml

@@ -9,15 +9,15 @@ env:
   IMAGE_NAME: rancher/harvester-os:${{ inputs.tag }}
 
 jobs:
-  generate-image-diff:
+  create-installer-pr:
     runs-on: ubuntu-latest
     container:
       image: registry.suse.com/bci/bci-base:15.5
-    steps:
+    needs: generate-image-diff
+    steps: 
       - name: fetch-target-version
         run: |
           echo "targetVersion=$(echo ${{ inputs.tag }} | cut -d'-' -f1)" >> $GITHUB_ENV
-          echo "Get targetVersion: $targetVersion"
       - name: Install docker
         run: zypper ref && zypper -n install docker
       - name: Pull release image
@@ -38,21 +38,11 @@ jobs:
           echo "Diff $BASE_OS_IMAGE with ${{ env.IMAGE_NAME }}..."
           container-diff diff daemon://docker.io/$BASE_OS_IMAGE daemon://docker.io/${{ env.IMAGE_NAME }} --type=rpm --output=diff-result.txt
           cat diff-result.txt
-          echo "packagesDiff=$(cat diff-result.txt)" >> $GITHUB_ENV
-
-  create-installer-pr:
-    runs-on: ubuntu-latest
-    needs: generate-image-diff
-    steps: 
-      - name: Download container-diff result
-        uses: actions/download-artifact@v3
-        with:
-          name: diff-result
-      - name: Read diff result
+      - name: Set diff result to environment variable
         run: |
-          echo "DIFF=$(cat ./diff-result.txt)" >> $GITHUB_ENV
-      - name: Remove unused files
-        run: rm diff-result.txt
+          echo "packagesDiff<<EOF" >> $GITHUB_ENV
+          cat diff-result.txt >> $GITHUB_ENV
+          echo "EOF" >> $GITHUB_ENV 
       - name: Clone harvester-installer repo
         uses: actions/checkout@v3
         with:
@@ -93,11 +83,9 @@ jobs:
     runs-on: ubuntu-latest
     needs: generate-image-diff
     steps:
-      - uses: jungwinter/split@v2
-        id: spliter
-        with:
-          msg: ${{ github.ref_name }}
-          separator: '-'
+      - name: fetch-target-version
+        run: |
+          echo "targetVersion=$(echo ${{ inputs.tag }} | cut -d'-' -f1)" >> $GITHUB_ENV
       - name: Clone Addons repo
         uses: actions/checkout@v3
         with: