remove google cloud build ci now that we're on appveyor

ci/build_windows.sh

@@ -1,14 +0,0 @@
-#!/bin/bash
-set -x
-
-WORKSPACE="workspace-${RANDOM}"
-AGENT_IP="$(gcloud compute instances describe ggpo-ci-build-win-01 --zone=us-central1-a --format='get(networkInterfaces[0].accessConfigs.natIP)')"
-SSH="ssh -o StrictHostKeyChecking=no"
-tar -cvf ggpo.tar . &> /dev/null
-
-${SSH} ponder@${AGENT_IP} "mkdir C:\\workspace\\${WORKSPACE}"
-scp ggpo.tar "ponder@${AGENT_IP}:/workspace/${WORKSPACE}"
-${SSH} ponder@${AGENT_IP} "cd C:\\workspace\\${WORKSPACE} && tar -xvf ggpo.tar && ci\\build_windows_agent.cmd"
-${SSH} ponder@${AGENT_IP} "rmdir /q/s C:\\workspace\\${WORKSPACE}"
-
-rm ggpo.tar

ci/build_windows_agent.cmd

@@ -1,11 +0,0 @@
-cmake -G "Visual Studio 16 2019" -A x64 -B build -DBUILD_SHARED_LIBS=off
-
-call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\Common7\Tools\VsDevCmd.bat"
-echo on
-
-devenv.exe "build\GGPO.sln" /build Release /out release.log
-type release.log
-
-devenv.exe "build\GGPO.sln" /build Debug /out debug.log
-type debug.log
-

cloudbuild.yaml

@@ -1,30 +0,0 @@
-# Decrypt the file containing the key
-steps:
-- name: 'gcr.io/cloud-builders/gcloud'
-  args:
-  - kms
-  - decrypt
-  - --ciphertext-file=./ci/id_rsa.enc
-  - --plaintext-file=/root/.ssh/id_rsa
-  - --location=global
-  - --keyring=ggpo-ci-keyring
-  - --key=buildagent-key
-  volumes:
-  - name: 'ssh'
-    path: /root/.ssh    
-- name: 'gcr.io/cloud-builders/git'
-  entrypoint: bash
-  args:
-    - '-c'
-    - |
-      chmod 600 /root/.ssh/id_rsa
-  volumes:
-    - name: 'ssh'
-      path: /root/.ssh    
-- name: 'gcr.io/cloud-builders/git'
-  entrypoint: bash
-  args:
-    - ./ci/build_windows.sh
-  volumes:
-  - name: 'ssh'
-    path: /root/.ssh