Use Elixir dependency cache in github actions

Author: dersmon

.github/workflows/publication.yml

@@ -22,6 +22,12 @@ jobs:
         working-directory: publication
       - name: Sleep to await CouchDB startup
         run: sleep 15s
+      - name: Restore dependencies cache
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+          restore-keys: ${{ runner.os }}-mix-
       - name: Install Field Publication dependencies and run setup
         run: mix setup
         working-directory: publication

.github/workflows/server.yml

@@ -22,6 +22,12 @@ jobs:
         working-directory: server
       - name: Sleep to await CouchDB startup
         run: sleep 15s
+      - name: Restore dependencies cache
+        uses: actions/cache@v3
+        with:
+          path: deps
+          key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+          restore-keys: ${{ runner.os }}-mix-
       - name: Install Field Hub dependencies and run setup
         run: mix setup
         working-directory: server