Remove pg12 from Matrix

Author: singhalkarun

.github/workflows/docker-image.yml

@@ -27,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        pg: [12, 13, 14, 15]
+        pg: [13, 14, 15]
         oss: [ "", "-oss" ]
     steps:
       - uses: actions/checkout@v3
@@ -66,7 +66,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        pg: [12, 13, 14, 15]
+        pg: [13, 14, 15]
 
     steps:
       - uses: actions/checkout@v3