Add Docker Action

- Upload latest + git commit has on ever push to main
- Upload latest_relesae when we do a github release

Need secrets added and potentially change of the Docker Hub image name etc.

.github/workflows/docker_upload.yml

@@ -0,0 +1,56 @@
+name: docker
+
+on:
+  push:
+    branches:
+      - "main"
+  release:
+    types: [published]
+
+permissions:
+  contents: read
+
+jobs:
+  docker:
+    if: github.repository == 'Kav-K/GPT3Discord'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Check + set version tag
+        run:
+          echo "GIT_TAG=$(git describe --candidates=0 --tags 2> /dev/null || echo
+          latest_non_release)" >> $GITHUB_ENV
+
+      - name: Build and push
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: Kav-K/GPT3Discord:latest,Kav-K/GPT3Discord:${{ env.GIT_TAG }}
+
+      - name: Build and push latest_release tag
+        if: ${{ github.event_name == 'release' && github.event.action == 'published' }}
+        uses: docker/build-push-action@v3
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: Kav-K/GPT3Discord:latest_release
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}