CI improvements (#867)

* Generate conan profile in CI

* Move linux build into main workflow

* Add saving/restoring conan data

* Move cache to Linux

* Fix error

* Change key to hash from conanfile

* Fix path error

* Populate cache only in develop branch

* Big refactor

- Move duplicated code to actions
- Isolate mac build from home directory
- Separate ccache and conan caches

* Fix errors

* Change ccache cache name and fix errors

* Always populate cache

* Use newer ccache on Linux

* Strip tests

* Better conan hash

.github/actions/clang_format/action.yml

@@ -0,0 +1,15 @@
+name: Check format
+description: Check format using clang-format-11
+runs:
+  using: composite
+  steps:
+    # Github's ubuntu-20.04 image already has clang-format-11 installed
+    - run: |
+        find src unittests -type f \( -name '*.cpp' -o -name '*.h' -o -name '*.ipp' \) -print0 | xargs -0 clang-format-11 -i
+      shell: bash
+
+    - name: Check for differences
+      id: assert
+      shell: bash
+      run: |
+        git diff --color --exit-code | tee "clang-format.patch"