Reduce scope of events used for triggering github actions.

Try using pip caching to improve efficiency of github actions.

.github/workflows/contract_tests.yml

@@ -2,7 +2,9 @@ name: '📃 Contract Tests'
 
 on:
   pull_request:
-    types: [opened, reopened, edited, ready_for_review, synchronize]
+    branches:
+      - main
+      - development
 
 concurrency:
   group: ci-tests-${{ github.ref }}-contracts
@@ -16,16 +18,13 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Python 3.10
+      - name: Set up Python 3.10 and install dependencies
         uses: actions/setup-python@v4
         with:
           # Semantic version range syntax or exact version of a Python version
           python-version: '3.10'
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install .[dev]
+          cache: 'pip'  # cache pip dependencies
+      - run: pip install .[dev]
 
       - name: Install Solidity Compiler
         run: python ./scripts/installation/install_solc.py

.github/workflows/darker.yml

@@ -1,6 +1,10 @@
 name: 🧹 Darker
 
-on: [push, pull_request]
+on:
+  pull_request:
+    branches:
+      - main
+      - development
 
 jobs:
   lint:
@@ -9,7 +13,7 @@ jobs:
       - uses: actions/checkout@v3
         with:
           fetch-depth: 0
-      - uses: actions/setup-python@v2
+      - uses: actions/setup-python@v4
       - uses: akaihola/darker@1.4.2
         with:
           options: "--check --diff --isort"

.github/workflows/python_tests.yml

@@ -2,7 +2,9 @@ name: '🔎 Python Tests'
 
 on:
   pull_request:
-    types: [opened, reopened, edited, ready_for_review, synchronize]
+    branches:
+      - main
+      - development
 
 concurrency:
   group: ci-tests-${{ github.ref }}-pytest
@@ -19,15 +21,12 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up Python ${{ matrix.python-version }}
+      - name: Set up Python ${{ matrix.python-version }} and install dependencies
         uses: actions/setup-python@v4
         with:
           python-version: ${{ matrix.python-version }}
-
-      - name: Install dependencies
-        run: |
-          python -m pip install --upgrade pip
-          pip install .[dev]
+          cache: 'pip'  # cache pip dependencies
+      - run: pip install .[dev]
 
       - name: Install Solidity Compiler
         run: python ./scripts/installation/install_solc.py

.github/workflows/run_demo.yml

@@ -2,7 +2,9 @@ name: '👷 Run Demo'
 
 on:
   pull_request:
-    types: [opened, reopened, edited, ready_for_review, synchronize]
+    branches:
+      - main
+      - development
 
 jobs:
   run-demo: