Update Docker image build pipelines (celestiaorg#990)

# PULL REQUEST

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## Overview

Updates the Docker image build Github Action Pipelines.

The `amd64-docker-build` job is run on all pushes to all branches. It
creates a `linux/amd64` docker image that is tagged with the short
commit sha.

[Example
Job](https://github.com/jbowen93/celestia-app/actions/runs/3432472621/jobs/5721783469)
w/ [resulting
image](https://github.com/jbowen93/celestia-app/pkgs/container/celestia-app/49690412?tag=sha-9087311)

The `main-docker-build` job runs on pushes to `main` as well as when any
new tags are pushed. It creates both a `linux/arm64` image and a
`linux/amd64` image. When run against `main` the image is tagged with
the short commit sha. When run against a tag the image is tagged with
the git tag.

[Example
Job](https://github.com/jbowen93/celestia-app/actions/runs/3432479009/jobs/5721797340)
w/ [resulting
image](https://github.com/jbowen93/celestia-app/pkgs/container/celestia-app/49692397?tag=sha-ff1c238)

[Example
Job](https://github.com/jbowen93/celestia-app/actions/runs/3432357771)
for a tagged run w/ [resulting
image](https://github.com/jbowen93/celestia-app/pkgs/container/celestia-app/49690070?tag=0.0.91-rc1).
## Checklist

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- [x] New and updated code has appropriate documentation
- [x] New and updated code has new and/or updated testing
- [x] Required CI checks are passing
- [x] Visual proof for any user facing features like CLI or
documentation updates
- [x] Linked issues closed with keywords

.github/workflows/amd64-docker-build.yml

@@ -0,0 +1,43 @@
+name: "amd64-docker-build"
+
+on:
+  push:
+    branches:
+      - "**"
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  docker-build:
+    runs-on: "ubuntu-latest"
+    permissions:
+      contents: write
+      packages: write
+    steps:
+      - uses: "actions/checkout@v3"
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=sha
+            type=semver,pattern={{version}}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to GHCR
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          platforms: linux/amd64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          file: Dockerfile

.github/workflows/main-docker-build.yml

@@ -0,0 +1,45 @@
+name: "main-docker-build"
+
+on:
+  push:
+    branches:
+      - main
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  docker-build:
+    runs-on: "ubuntu-latest"
+    permissions:
+      contents: write
+      packages: write
+    steps:
+      - uses: "actions/checkout@v3"
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=sha
+            type=semver,pattern={{version}}
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Login to GHCR
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          platforms: linux/arm64, linux/amd64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          file: Dockerfile