add workflow

.github/workflows/update-episodes.yml

@@ -0,0 +1,52 @@
+name: "Update episodes"
+
+on:
+    workflow_dispatch:
+    push:
+        branches:
+            - literate
+
+jobs:
+    generate-md-files:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@v3
+              with:
+                ref: 'literate'
+            - uses: julia-actions/setup-julia@latest
+              with:
+                version: '1.9'
+            - uses: julia-actions/cache@v1
+            - name: Run the generate script
+              shell: julia --project=@. --color=yes {0}
+              run: |
+                include(joinpath(pwd(), "generate.jl"))
+            - name: Upload output
+              uses: actions/upload-artifact@v3
+              with:
+                name: output
+                path: output
+    move-files-to-main:
+        runs-on: ubuntu-latest
+        needs: generate-md-files
+        steps:
+            - uses: actions/checkout@v3
+              with:
+                ref: 'main'
+            - name: Download files
+              uses: actions/download-artifact@v3
+              with:
+                name: output
+                path: output
+            - name: Move files
+              run: |
+                ls -RF
+                mv output/carpentries/*.md episodes
+            - name: Create Pull Request
+              uses: peter-evans/create-pull-request@v5
+              with:
+                delete-branch: true
+                base: main
+                title: Update episodes from Literate.jl source files
+                add-paths: episodes
+