Workshop deployment via github actions (#2651)

* Workshop deployment via github actions

* Lua 5.4 `string.pack` implementation

Also fixed reference to wiremod/workshop-upload, since we don't have it on the github market. Need anticept to agree to some licensing thing

* Use new gmod-upload action

Includes the gma packer inside.

Much more minimal implementation from scratch that doesn't use docker, just a composite action running bash scripts.

.github/workflows/deploy.yml

@@ -0,0 +1,18 @@
+name: Deploy to Workshop
+
+on:
+  workflow_dispatch:
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@master
+      - uses: wiremod/gmod-upload@4bc2dfb88010f343e5ee121b02110151343ec8dd
+        with:
+          id: 160250458
+          changelog: "Deployment via Github to latest changes"
+        env:
+          STEAM_USERNAME: ${{ secrets.STEAM_USERNAME }}
+          STEAM_PASSWORD: ${{ secrets.STEAM_PASSWORD }}