[ci] Migrate CI from GitLab to GitHub (#593)

* [ci] Migrate CI from GitLab to GitHub

* fix docker path

* unite backend jobs into one workflow

* rm files

* add cache-on-failure to tests cache

* add deploy workflow

* change wfl name

* readme

* fix readme

* typo

.github/workflows/docker-build.yml

@@ -0,0 +1,73 @@
+name: Docker Build
+# Workflow checks that docker build works
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened, ready_for_review]
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+env:
+  IMAGE_NAME: parity/substrate-telemetry
+
+jobs:
+  set-variables:
+    name: Set variables
+    runs-on: ubuntu-latest
+    outputs:
+      VERSION: ${{ steps.version.outputs.VERSION }}
+    steps:
+      - name: Define version
+        id: version
+        run: |
+          export COMMIT_SHA=${{ github.sha }}
+          export COMMIT_SHA_SHORT=${COMMIT_SHA:0:8}
+          export REF_NAME=${{ github.ref_name }}
+          export REF_SLUG=${REF_NAME//\//_}
+          if [[ ${REF_SLUG} == "main" ]]
+          then
+            echo "VERSION=${REF_SLUG}-${COMMIT_SHA_SHORT}" >> $GITHUB_OUTPUT
+          else
+            echo "VERSION=${REF_SLUG}" >> $GITHUB_OUTPUT
+          fi
+          echo "set VERSION=${VERSION}"
+
+  build_backend:
+    name: Build backend docker image
+    runs-on: ubuntu-latest
+    needs: [set-variables]
+    env:
+      VERSION: ${{ needs.set-variables.outputs.VERSION }}
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Build and push Docker image from main
+        uses: docker/build-push-action@v5
+        with:
+          context: backend
+          file: ./backend/Dockerfile
+          push: false
+          tags: |
+            ${{ env.IMAGE_NAME }}-backend:${{ env.VERSION }}
+
+  build_frontend:
+    name: Build frontend docker image
+    runs-on: ubuntu-latest
+    needs: [set-variables]
+    env:
+      VERSION: ${{ needs.set-variables.outputs.VERSION }}
+    steps:
+      - name: Check out the repo
+        uses: actions/checkout@v4
+
+      - name: Build and push Docker image from main
+        uses: docker/build-push-action@v5
+        with:
+          context: frontend
+          file: ./frontend/Dockerfile
+          push: false
+          tags: |
+            ${{ env.IMAGE_NAME }}-frontend:${{ env.VERSION }}