Workflow: use actions for cadius and ca65

.github/workflows/main.yml

@@ -14,18 +14,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-
-      - name: build and install cc65 components
-        run: >
-          git clone https://github.com/cc65/cc65 /tmp/cc65 &&
-          sudo make -C /tmp/cc65 ca65 ld65 avail &&
-          ca65 --version
-
-      - name: build and install cadius
-        run: >
-          git clone https://github.com/mach-kernel/cadius /tmp/cadius &&
-          make -C /tmp/cadius &&
-          sudo make -C /tmp/cadius install
+      - uses: a2stuff/build-install-ca65-action@v1
+      - uses: a2stuff/build-install-cadius-action@v1
 
       - name: build
         env: