Auto merge of #1924 - JohnTitor:upload-docs, r=JohnTitor

Upload documentation to gh-pages from GHA

I missed this on #1918 

.github/workflows/docs.yml

+name: Upload documentation
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  upload_docs:
+    name: Upload documentation
+    runs-on: ubuntu-18.04
+    if: github.repository == 'rust-lang/libc'
+
+    steps:
+      - uses: actions/checkout@v2
+      - name: Setup Rust toolchain
+        run: TARGET=x86_64-unknown-linux-gnu sh ./ci/install-rust.sh
+      - name: Generate documentation
+        run: LIBC_CI=1 sh ci/dox.sh
+      - name: Upload documentation to GitHub Pages
+        uses: rust-lang/simpleinfra/github-actions/static-websites@master
+        with:
+          deploy_dir: target/doc
+          github_token: "${{ secrets.GITHUB_TOKEN }}"
+        if: github.ref == 'refs/heads/master'

ci/azure-master.yml

-variables:
-  - group: secrets
-resources:
-  repositories:
-    - repository: rustinfra
-      type: github
-      name: rust-lang/simpleinfra
-      endpoint: gnzlbg
-trigger: ["master"]
-pr: ["master"]
-
-jobs:
-  - job: StyleAndDocs
-    pool:
-      vmImage: ubuntu-18.04
-    steps:
-      - template: azure-install-rust.yml
-      - script: LIBC_CI=1 sh ci/dox.sh
-        displayName: Generate documentation
-      - template: azure-configs/static-websites.yml@rustinfra
-        parameters:
-          deploy_dir: target/doc