.github/workflows: remove fuzzit.dev

All fuzzit.dev jobs become broken recently, see e.g.:
https://github.com/google/syzkaller/pull/2351/checks?check_run_id=1601794199
...
{"status":"Status: Downloaded newer image for gcr.io/fuzzit-public/stretch-llvm8:64bdedf"}
Downloading fuzzit cli/agent...
Error: Process completed with exit code 1.

https://github.com/fuzzitdev/fuzzit is archived now and the README says:
"the standalone service will soon be deperecated".

So I guess it's time to remove fuzzit.dev integration.

3 files changed, 0 insertions, 53 deletions

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e6da2454b..97b993a42 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -100,27 +100,3 @@ jobs:
           key: cache
       - name: run
         run: gopath/src/github.com/google/syzkaller/.github/workflows/run.sh syz-old-env make presubmit_old
-  fuzzit:
-    runs-on: ubuntu-latest
-    needs: [smoke]
-    steps:
-      - name: checkout
-        uses: actions/checkout@v2
-        with:
-          path: gopath/src/github.com/google/syzkaller
-      - name: cache
-        uses: actions/cache@v1
-        with:
-          path: .cache
-          key: cache
-      - name: regression
-        if: ${{ github.event_name == 'pull_request' }}
-        # We use syz-old-env because it contains Go 1.14.
-        # syz-env contains Go 1.15 and go-fuzz is broken with Go 1.15:
-        # https://github.com/dvyukov/go-fuzz/issues/294
-        run: gopath/src/github.com/google/syzkaller/.github/workflows/run.sh syz-old-env tools/fuzzit.sh local-regression
-      - name: fuzzing
-        if: ${{ github.event_name == 'push' && github.ref == 'refs/heads/master' }}
-        env:
-          FUZZIT_API_KEY: ${{ secrets.FUZZIT_API_KEY }}
-        run: gopath/src/github.com/google/syzkaller/.github/workflows/run.sh syz-old-env tools/fuzzit.sh fuzzing
diff --git a/README.md b/README.md
index 4e8185cd4..881c353da 100644
--- a/README.md
+++ b/README.md
@@ -1,7 +1,6 @@
 # syzkaller - kernel fuzzer
 
 [![CI Status](https://github.com/google/syzkaller/workflows/ci/badge.svg)](https://github.com/google/syzkaller/actions?query=workflow/ci)
-[![fuzzit](https://app.fuzzit.dev/badge?org_id=syzkaller=master)](https://fuzzit.dev)
 [![OSS-Fuzz](https://oss-fuzz-build-logs.storage.googleapis.com/badges/syzkaller.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?q=label:Proj-syzkaller)
 [![Go Report Card](https://goreportcard.com/badge/github.com/google/syzkaller)](https://goreportcard.com/report/github.com/google/syzkaller)
 [![Coverage Status](https://codecov.io/gh/google/syzkaller/graph/badge.svg)](https://codecov.io/gh/google/syzkaller)
diff --git a/tools/fuzzit.sh b/tools/fuzzit.sh
deleted file mode 100755
index 66dfa3224..000000000
--- a/tools/fuzzit.sh
+++ /dev/null
@@ -1,28 +0,0 @@
-#!/usr/bin/env bash
-# Copyright 2019 syzkaller project authors. All rights reserved.
-# Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
-
-# Helper script for working with fuzzit.dev
-# https://github.com/fuzzitdev/example-go
-
-set -eux
-export TYPE="${1}"
-export GOBIN=$(realpath .)/bin
-
-function target {
-	bin/go-fuzz-build -libfuzzer -func $3 -o fuzzer.a $2
-	clang -fsanitize=fuzzer fuzzer.a -o fuzzer
-	./fuzzit create job --type "${TYPE}" --branch ${GITHUB_REF#refs/heads/} --revision ${GITHUB_SHA} syzkaller/$1 ./fuzzer
-}
-
-go install github.com/dvyukov/go-fuzz/go-fuzz-build
-
-curl -L --output fuzzit https://github.com/fuzzitdev/fuzzit/releases/download/v2.4.77/fuzzit_Linux_x86_64
-chmod a+x fuzzit
-
-make descriptions
-target syzkaller-prog-deserialize ./prog/test FuzzDeserialize
-target syzkaller-prog-parselog ./prog/test FuzzParseLog
-target syzkaller-compiler ./pkg/compiler Fuzz
-target syzkaller-report ./pkg/report Fuzz
-target syzkaller-trace2syz ./tools/syz-trace2syz/proggen Fuzz