added main.yaml workflow file

.github/workflows/main.yaml

@@ -0,0 +1,32 @@
+name: List all S3 buckets
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+env:
+  AWS_REGION : "us-east-1"
+
+permissions:
+      id-token: write   # This is required for requesting the JWT
+      contents: read    # This is required for actions/checkout
+jobs:
+  AssumeRoleAndCallIdentity:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Git clone the repository
+        uses: actions/checkout@v3
+      - name: configure aws credentials
+        uses: aws-actions/[email protected]
+        with:
+          role-to-assume: arn:aws:iam::851725231363:role/github-oidc-assume-role
+          role-session-name: GitHub_to_AWS_via_FederatedOIDC
+          aws-region: ${{ env.AWS_REGION }}
+      - name: Sts GetCallerIdentity
+        run: |
+          aws sts get-caller-identity
+      - name: List Buckets
+        run: |
+          aws s3 ls