Enable builds on GitHub actions

.github/workflows/main.yml

@@ -0,0 +1,34 @@
+name: CI
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: nixbuild/nix-quick-install-action@v5
+        with:
+          nix_version: 2.4pre20201205_a5d85d0
+          nix_conf: experimental-features = nix-command flakes
+      - uses: actions/checkout@v2
+      # TODO reuse cache even when key changes and then do GC
+      - uses: actions/cache@v2
+        id: cache-nix
+        with:
+          path:  ~/nix
+          key: ${{ hashFiles('flake.nix') }}-${{ hashFiles('flake.lock') }}-${{ hashFiles('deps.nix') }}
+      - name: Extract the cache
+        if: steps.cache-nix.outputs.cache-hit
+        run: sudo mkdir -p /nix && sudo rsync --recursive --archive ~/nix/ /nix
+      - name: Build
+        run: 'outpath="$(nix build --print-build-logs --no-link --json .# | jq -r .[0].outputs.out)" && echo "tinyquiz-build=$outpath" >> $GITHUB_ENV'
+      - uses: actions/upload-artifact@v2
+        with:
+          path: ${{ env.tinyquiz-build }}/**
+          retention-days: 7
+          if-no-files-found: error
+      - name: Prepare /nix/store for caching
+        if: '!steps.cache-nix.outputs.cache-hit'
+        run: sudo rsync --recursive --archive /nix/ ~/nix

cmd/web/main.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"context"
-	"fmt"
 	"html/template"
 	"log"
 	"net/http"
@@ -10,6 +9,7 @@ import (
 	"time"
 	"vkane.cz/tinyquiz/pkg/model"
 	"vkane.cz/tinyquiz/pkg/model/ent"
+	"vkane.cz/tinyquiz/pkg/model/ent/migrate"
 	rtcomm "vkane.cz/tinyquiz/pkg/rtcomm"
 
 	"github.com/julienschmidt/httprouter"
@@ -47,7 +47,7 @@ func main() {
 	}
 
 	if c, err := ent.Open("postgres", "host='127.0.0.1' sslmode=disable dbname=tinyquiz"); err == nil {
-		if err := c.Schema.Create(context.Background()); err != nil {
+		if err := c.Schema.Create(context.Background(), migrate.WithDropIndex(true), migrate.WithDropColumn(true)); err != nil {
 			errorLog.Fatal(err)
 		}
 		app.model = model.NewModel(c)
@@ -57,9 +57,9 @@ func main() {
 
 	//TODO remove debug print
 	go func() {
-		for range time.Tick(2*time.Second){
-			sessions, clients := app.rtClients.Count()
-			fmt.Printf("There are %d sessions with total of %d clients\n", sessions, clients)
+		for range time.Tick(2 * time.Second) {
+			//sessions, clients := app.rtClients.Count()
+			//fmt.Printf("There are %d sessions with total of %d clients\n", sessions, clients)
 		}
 	}()