proto: update the mechanism for generating protos from spec repo (#7269)

This pull request updates the `protocgen.sh` script to insert the `go_package` option to all of the downloaded proto files. A related pull request into the spec repo removes this options from the .proto files: https://github.com/tendermint/spec/pull/358

This pull requests, along with the related spec PR, aim to move the creation of the `tendermintdev/docker-build-proto` container into the spec repo. This change also relies on several fixes to that container that are made in the PR into the spec repo.

.github/workflows/proto-docker.yml

@@ -1,51 +0,0 @@
-name: Build & Push TM Proto Builder
-on:
-  pull_request:
-    paths:
-      - "tools/proto/*"
-  push:
-    branches:
-      - master
-    paths:
-      - "tools/proto/*"
-  schedule:
-    # run this job once a month to recieve any go or buf updates
-    - cron: "* * 1 * *"
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2.4.0
-      - name: Prepare
-        id: prep
-        run: |
-          DOCKER_IMAGE=tendermintdev/docker-build-proto
-          VERSION=noop
-          if [[ $GITHUB_REF == refs/tags/* ]]; then
-            VERSION=${GITHUB_REF#refs/tags/}
-          elif [[ $GITHUB_REF == refs/heads/* ]]; then
-            VERSION=$(echo ${GITHUB_REF#refs/heads/} | sed -r 's#/+#-#g')
-            if [ "${{ github.event.repository.default_branch }}" = "$VERSION" ]; then
-              VERSION=latest
-            fi
-          fi
-          TAGS="${DOCKER_IMAGE}:${VERSION}"
-          echo ::set-output name=tags::${TAGS}
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v1.6.0
-
-      - name: Login to DockerHub
-        uses: docker/login-action@v1.10.0
-        with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Publish to Docker Hub
-        uses: docker/build-push-action@v2.7.0
-        with:
-          context: ./tools/proto
-          file: ./tools/proto/Dockerfile
-          push: ${{ github.event_name != 'pull_request' }}
-          tags: ${{ steps.prep.outputs.tags }}