chore(cd): add badger binary to dgraph docker image (#8790)

In releases <=v21 we included the badger CLI tool in our dgraph docker
images. We make this a part of our cd pipeline again.

.github/workflows/cd-dgraph.yml

@@ -75,6 +75,12 @@ jobs:
             badger/badger-linux-amd64.tar.gz
             dgraph/dgraph-checksum-linux-amd64.sha256
             dgraph/dgraph-linux-amd64.tar.gz
+      - name: Move Badger Binary into Linux Directory
+        run: |
+          tar -xzf badger/badger-linux-amd64.tar.gz --directory badger
+          [ -d "linux" ] || mkdir linux
+          # linux directory will be added to docker image in build step
+          cp badger/badger-linux-amd64 linux/badger
       - name: Make Dgraph Docker Image
         run: |
           make docker-image DGRAPH_VERSION=${{ env.DGRAPH_RELEASE_VERSION }}-amd64
@@ -157,6 +163,12 @@ jobs:
             badger/badger-linux-arm64.tar.gz
             dgraph/dgraph-checksum-linux-arm64.sha256
             dgraph/dgraph-linux-arm64.tar.gz
+      - name: Move Badger Binary into Linux Directory
+        run: |
+          tar -xzf badger/badger-linux-arm64.tar.gz --directory badger
+          [ -d "linux" ] || mkdir linux
+          # linux directory will be added to docker image in build step
+          cp badger/badger-linux-arm64 linux/badger
       - name: Make Dgraph Docker Image
         run: |
           make docker-image DGRAPH_VERSION=${{ env.DGRAPH_RELEASE_VERSION }}-arm64