Add GitHub Action job to update apt repo

This automatically adds the produced .deb into our own apt repo.

We only run this job for tagged releases for now.

Installation instructions for Debian / Ubuntu have been updated.

.github/workflows/test.yml

@@ -104,6 +104,47 @@ jobs:
           path: ${{ steps.artifact_dir.outputs.dir }}/*deb/
           if-no-files-found: error
 
+  update-apt-repo:
+    if: startsWith(github.ref, 'refs/tags/v')
+    runs-on: ubuntu-latest
+    container:
+      image: debian:bullseye
+    needs: build-debs
+    steps:
+      - name: Install build prerequisites
+        run: |
+          apt-get update
+          apt-get install -qy git gnupg reprepro
+      - name: Import GPG key
+        id: import_gpg
+        uses: crazy-max/ghaction-import-gpg@v4
+        with:
+          gpg_private_key: ${{ secrets.APT_GPG_PRIVATE_KEY }}
+      - name: Check out code of apt.acton-lang.io repo
+        uses: actions/checkout@v2
+        with:
+          repository: actonlang/apt.acton-lang.io
+          path: apt
+          ssh-key: ${{ secrets.APT_DEPLOY_KEY }}
+      - name: "Download artifacts for Debian Linux"
+        uses: actions/download-artifact@v2
+        with:
+          name: acton-debian
+      - name: "Include new deb in Apt repository"
+        run: |
+          cd apt
+          reprepro include bullseye ../deb/*.changes
+      - name: "Push updates to git repository for apt.acton-lang.io"
+        run: |
+          cd apt
+          git config user.name "Apt Bot"
+          git config user.email [email protected]
+          git add .
+          git status
+          git diff
+          git commit -a -m "Updated apt package index"
+          git push
+
 
   # If we are on the main branch, we'll create or update a pre-release called
   # 'tip' which holds the latest build output from the main branch!  We upload

README.md

@@ -36,18 +36,19 @@ work fairly well.
 
 ## Install acton
 
-### Debian / Ubuntu by downloading .deb
+### Debian / Ubuntu via apt repository
 
-There are pre-built .deb packages available via GitHub Releases. Download the
-latest one from [the Release page](https://github.com/actonlang/acton/releases).
+Install Acton via apt repository:
 
-```
-$ wget https://github.com/actonlang/acton/releases/download/v0.6.2/acton_0.6.2_amd64.deb
-$ dpkg -i acton_0.6.2_amd64.deb
-$ apt-get -f install
+```sh
+wget -q -O - https://apt.acton-lang.io/acton.gpg | sudo apt-key add -
+echo "deb http://apt.acton-lang.io/ bullseye main" | sudo tee /etc/apt/sources.list.d/acton.list
+sudo apt-get update
+sudo apt-get install -qy acton
 ```
 
 ### Mac OS X using Homebrew
+
 Acton is available as a Homebrew tap, which can be installed with:
 ```
 brew install actonlang/acton/acton