github: add docker ci

Signed-off-by: Gunwant Jain <mail@wantguns.dev>

.github/workflows/docker.yml

@@ -0,0 +1,78 @@
+name: Docker CI
+
+on:
+  push:
+    tags: 
+     - 'v*'
+
+jobs:
+  docker-build:
+    strategy:
+      matrix:
+        arch: [amd64, arm64]
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout project
+        uses: actions/checkout@v2
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: wantguns
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Building the ${{ matrix.arch }} image
+        run: |
+          docker build . \
+            -t wantguns/bin:${{ matrix.arch }} \
+            --build-arg ARCH=${{ matrix.arch }}
+          mkdir -p artifacts/images
+          docker save wantguns/bin:${{ matrix.arch }} > artifacts/images/${{ matrix.arch }}.tar
+
+      - name: Pushing the ${{ matrix.arch }} image
+        run: |
+          docker push wantguns/bin:${{ matrix.arch }}
+
+      - name: Temporarily saving the image
+        uses: actions/upload-artifact@v2
+        with:
+          name: docker-artifacts
+          path: artifacts/images
+          retention-days: 1 
+
+
+  docker-push:
+    needs: docker-build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Login to DockerHub
+        uses: docker/login-action@v1 
+        with:
+          username: wantguns
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+
+      - name: Retrieve saved images
+        uses: actions/download-artifact@v2
+        with:
+          name: docker-artifacts
+          path: artifacts/images
+
+      - name: Docker load images
+        run: |
+          pushd artifacts/images
+          docker load < amd64.tar
+          docker load < arm64.tar
+
+      - name: Creating a multi-arch manifest
+        run: |
+          docker manifest create \
+            wantguns/bin:latest \
+            --amend wantguns/bin:amd64 \
+            --amend wantguns/bin:arm64
+          
+          docker manifest annotate wantguns/bin:latest \
+            wantguns/bin:arm64 --arch arm64
+
+      - name: Push the manifest
+        run: |
+          docker manifest push wantguns/bin:latest

readme.md

@@ -193,6 +193,6 @@ BIN_IDENT=false
 This pastebin: 
 
 - does not use a database. It lacks non-essential features like password-protection / automatic deletion as a result of which, it can do completely fine with flat filesystems. As an upside (opinionated), it makes deploying it easier.
-- uses server sided highlighting, which ensures that everything stays light and snappy at the server side.
+- uses server sided highlighting, which ensures that everything stays light and snappy at the client side.
 - uses very minimal frontend because a pastebin does not need it. It focuses (or atleast tries to) on getting things done in minimum amount of clicks.