Adding Github CI to push to Docker Hub on tag

.dockerignore

@@ -1,4 +1,5 @@
 .git*
 *.md
 *.yml
+avatar.png
 .DS_Store

.github/workflows/main.yml

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+name: Publish Docker image
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  push_to_registry:
+    name: Push Docker image to Docker Hub
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v2
+
+      - name: Log in to Docker Hub
+        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
+        with:
+          images: mountainash/openssh-client
+
+      - name: Build and push Docker image
+        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

CHANGELOG.md

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+# v1.1.2
+## Features
+- Added Github Actions to build and push the image to Docker Hub (as it's [a bit of a mess to do 2 pushes in a Gitlab CI](https://gitlab.com/gitlab-org/gitlab/-/issues/277167))
+
 # v1.1.1
 ## Features
 - Added a push mirror from GitLab to Github