ci: update actions to v7/v6, add pip caching, optimize Dockerfile layer order

.github/workflows/test_pip.yml

@@ -1,33 +1,33 @@
-name: pip install
-run-name: pip install
-on: 
-  push:
-    paths:
-      - '**.py'
-      - 'pyproject.toml'
-  pull_request:
-    paths:
-      - '**.py'
-      - 'pyproject.toml'
-      - '.github/workflows/**'
-  workflow_dispatch:
-jobs:
-  install-and-run:
-    strategy:
-      matrix:
-        os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ['3.12']
-      fail-fast: false
-    continue-on-error: true
-    runs-on: ${{ matrix.os }}
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-      - name: Set up Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: ${{ matrix.python-version }}
-      - name: Install from repository
-        run: python -m pip install .
-      #- name: Run abogen
-      #  run: abogen
+name: pip install
+run-name: pip install
+on: 
+  push:
+    paths:
+      - '**.py'
+      - 'pyproject.toml'
+  pull_request:
+    paths:
+      - '**.py'
+      - 'pyproject.toml'
+      - '.github/workflows/**'
+  workflow_dispatch:
+jobs:
+  install-and-run:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+        python-version: ['3.12']
+      fail-fast: false
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: ${{ matrix.python-version }}
+          cache: pip
+      - name: Install from repository
+        run: python -m pip install .
+      #- name: Run abogen
+      #  run: abogen