Use github actions (#59)

use github actions for the page build

(replacing travis-ci)

note: does not work yet, needs more work on the key.

Author: samuel-w

.github/workflows/main.yml

@@ -0,0 +1,58 @@
+name: Update pages
+on: [push]
+
+jobs:
+  update-web:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: actions/setup-python@v2
+      with:
+         python-version: '3.8'   
+    - name: Publish pages to web
+      shell: bash
+      env:
+         encrypted_54b6162b97cf_key: ${{ secrets.encrypted_key }}
+         encrypted_54b6162b97cf_iv: ${{ secrets.encrypted_iv }}
+      run: |
+        # Only build the "source" branch ("master" = built, published pages,
+        # this can't be changed for organization GitHub Pages)
+        test ${GITHUB_REF##*/} == "source" || exit 0
+        
+        # Install dependency
+        pip install docutils
+        
+        # Add git metadata
+        git config user.name "Automated build"
+        git config user.email "[email protected]"
+
+        # Build the pages
+        make clean
+        make
+
+        # Delete workflow for the output ("master") branch,
+        # so GitHub won't even trigger a build for it.
+        rm .github/workflows/main.yml
+        git add --all .
+        git commit -m "Automatically built pages at $(git rev-parse --short HEAD)" || exit 0
+
+        # travis/github_deploy_key.enc is an encrypted SSH key.
+        # The keys for this key are stored with GitHub and are exposed in the
+        # $encrypted... environment variables. (These are *not* available in pull request builds!)
+        # The public key is set up as a deployment key in the GitHub repository.
+        # The following document explains the process:
+        # https://docs.github.com/en/free-pro-team@latest/actions/reference/encrypted-secrets
+        openssl aes-256-cbc -K $encrypted_54b6162b97cf_key -iv $encrypted_54b6162b97cf_iv -in .travis/github_deploy_key.enc -out github_deploy_key -d
+
+        # Add the SSH key
+        chmod 600 github_deploy_key
+        eval `ssh-agent -s`
+        ssh-add github_deploy_key
+
+        # Push changes to the *master* branch
+        # Remember, this is building the *source* branch.
+        git push --force [email protected]:borgbackup/borgbackup.github.io.git HEAD:master
+
+        # Kill SSH agent, get rid of the key (GitHub does that as well)
+        kill $SSH_AGENT_PID
+        shred -u github_deploy_key

README.md

@@ -1,12 +1,12 @@
 # www.borgbackup.org
 
-[![Build Status](https://travis-ci.org/borgbackup/borgbackup.github.io.svg?branch=source)](https://travis-ci.org/borgbackup/borgbackup.github.io)
+[![Build Status](https://github.com/borgbackup/borgbackup.github.io/workflows/Update%20pages/badge.svg)](https://github.com/borgbackup/borgbackup.github.io/actions)
 
 This is the project web site of BorgBackup.
 
 All pages are meant to load very quickly with few/no external resources. All pages are generated from rST.
 
-HTML files are **never** committed to this ("source") branch. Travis automatically updates
+HTML files are **never** committed to this ("source") branch. Github Actions automatically updates
 the published ("master") branch. **Therefore pull requests should be submitted only to the "source" branch.**
 
 To locally preview changes, update the HTML after editing a rST file, run `make`.
@@ -30,7 +30,7 @@ https://borgbackup.readthedocs.io/en/latest/development.html#building-the-docs-w
 
 ## Setup
 
-Travis builds the "source" branch, generates HTML, commits it and
+Github Actions builds the "source" branch, generates HTML, commits it and
 pushes it to the "master" branch with a GitHub deploy key.
 
 GitHub Pages is used as the host, TLS cert comes from LetsEncrypt (via GitHub).