Ci publish rustdocs GitHub (#2895)

* ci: publish rustdocs to github repo substrate-developer-hub/rustdocs

substrate/.gitlab-ci.yml

@@ -313,6 +313,48 @@ publish-s3-doc:
     - aws s3 ls s3://${BUCKET}/${PREFIX}/
         --human-readable --summarize
 
+
+publish-gh-doc:
+  stage:                           publish
+  image:                           parity/tools:latest
+  allow_failure:                   true
+  dependencies:
+    - build-rust-doc-release
+  cache:                           {}
+  <<:                              *build-only
+  <<:                              *kubernetes-build
+  variables:
+    GIT_STRATEGY:                  none
+    GITHUB_API:                    "https://api.github.com"
+  script:
+    - test -r ./crate-docs/index.html || (
+        echo "./crate-docs/index.html not present, build:rust:doc:release job not complete";
+        exit 1
+      )
+    - test "${GITHUB_USER}" -a "${GITHUB_EMAIL}" -a "${GITHUB_TOKEN}" || (
+        echo "environment variables for github insufficient";
+        exit 1
+      )
+    - |
+      cat > ${HOME}/.gitconfig <<EOC
+      [user]
+      name = "${GITHUB_USER}"
+      email = "${GITHUB_EMAIL}"
+
+      [url "https://${GITHUB_USER}:${GITHUB_TOKEN}@github.com/"]
+      insteadOf = "https://github.com/"
+      EOC
+    - unset GITHUB_TOKEN
+    - git clone https://github.com/substrate-developer-hub/rustdocs.git
+    - rsync -ax --delete ./crate-docs/ ./rustdocs/${CI_COMMIT_REF_NAME}/
+    - cd ./rustdocs; git add .
+    - git commit -m "update rustdoc ${CI_COMMIT_REF_NAME}"
+    - git push origin master 2>&1 | sed -r "s|(${GITHUB_USER}):[a-f0-9]+@|\1:REDACTED@|g"
+  after_script:
+    - rm -vrf ${HOME}/.gitconfig
+
+
+
 .deploy-template:                  &deploy
   stage:                           kubernetes
   when:                            manual