Add PG_MAJOR as Github Env Var

.github/workflows/build_and_test.yml

@@ -103,6 +103,9 @@ jobs:
       options: --user root
     steps:
     - uses: actions/checkout@v3.5.0
+    - name: Expose PG_MAJOR to Github Env
+      run: echo "PG_MAJOR=${PG_MAJOR}" >> $GITHUB_ENV
+      shell: bash
     - name: Build
       run: "./ci/build-citus.sh"
       shell: bash
@@ -164,6 +167,9 @@ jobs:
     - build
     steps:
     - uses: actions/checkout@v3.5.0
+    - name: Expose PG_MAJOR to Github Env
+      run: echo "PG_MAJOR=${PG_MAJOR}" >> $GITHUB_ENV
+      shell: bash
     - uses: actions/download-artifact@v3.0.1
       with:
         name: build-${{ env.PG_MAJOR }}
@@ -185,7 +191,7 @@ jobs:
     - uses: "./.github/actions/upload_coverage"
       if: always()
       with:
-        flags: test_${{ matrix.pg_major }},${{ matrix.make }}
+        flags: test_${{ env.pg_major }},${{ matrix.make }}
 
   # - check-failure
   # - check-arbitrary-configs