ci: removes deprecated release scripts and adds docker release workflow

.github/workflows/docker_release.yml

@@ -0,0 +1,51 @@
+name: Build and Push Docker Image
+# https://github.com/sigstore/cosign
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Docker image tag'
+        required: true
+        default: 'latest'
+
+jobs:
+  build-and-push:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      id-token: write
+
+    steps:
+    - name: Check out code
+      uses: actions/checkout@v3
+
+    - name: Install cosign
+      uses: sigstore/cosign-installer@v3
+
+    - name: Log in to Docker Hub
+      uses: docker/login-action@v2
+      with:
+        registry: docker.io
+        username: ${{ secrets.DOCKERHUB_USERNAME }}
+        password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+    - name: Set up Docker Buildx
+      uses: docker/setup-buildx-action@v2
+
+    - name: Build and push Docker image
+      uses: docker/build-push-action@v4
+      with:
+        context: .
+        push: true
+        tags: |
+          opentensorfdn/bittensor:${{ github.event.inputs.tag }}
+          opentensorfdn/bittensor:latest
+        provenance: false
+
+    - name: Sign the images with GitHub OIDC Token
+      env:
+        DIGEST: ${{ steps.build.outputs.digest }}
+        TAGS: ${{ steps.build.outputs.tags }}
+      run: |
+        echo "${TAGS}" | xargs -I {} cosign sign --yes {}@${DIGEST}