ci: attempt to configure docker build using gh actions

.github/workflows/docker.yml

@@ -0,0 +1,41 @@
+name: Publish Docker Image
+
+on:
+  push:
+    tags:
+      - '*.*.*'
+      - '!*.*.*-*'
+
+jobs:
+  docker-publish:
+    runs-on: ubuntu-latest
+    steps:
+      # https://stackoverflow.com/questions/58177786
+      - name: Get version
+        run: echo "GIT_TAG=${GITHUB_REF#refs/*/}" >> $GITHUB_ENV
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v1
+
+      - name: Cache Docker layers
+        uses: actions/cache@v2
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ github.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push to Docker Hub
+        uses: docker/build-push-action@v2
+        with:
+          push: true
+          tags: |
+            n1try/webhook2telegram:${{ env.GIT_TAG }}
+            n1try/webhook2telegram:latest
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache

README.md

@@ -2,7 +2,6 @@
 (formerly _telegram-middleman-bot_)
 
 [![](http://img.shields.io/liberapay/receives/muety.svg?logo=liberapay)](https://liberapay.com/muety/)
-[![Say thanks](https://badges.fw-web.space/badge/SayThanks.io-%E2%98%BC-1EAEDB.svg)](https://saythanks.io/to/n1try)
 ![](https://badges.fw-web.space/github/license/muety/webhook2telegram)
 ![Coding Activity](https://badges.fw-web.space/endpoint?url=https://wakapi.dev/api/compat/shields/v1/n1try/interval:any/project:webhook2telegram&color=blue)
 [![Go Report Card](https://goreportcard.com/badge/github.com/muety/webhook2telegram)](https://goreportcard.com/report/github.com/muety/telegram-middleman-bot)