Merge upstream (#8)

* Added Spline option for Central Orbits

Central orbits may now read time/position/velocity points from an input file (as from GMAT, for instance) and interpolate with cubic splines.

* Cleanup before push

* Merge branch 'master' of https://github.com/ericstoneking/42

* Fixed GPS Epoch

Added offset between UTC and TT at GPS epoch in GpsTimeToJD and JDToGpsTime

* GPS Time Accuracy

Replaced JDToGpsTime with GpsTimeToGpsDate to reduce roundoff error.

* Add docker push github action

---------

Co-authored-by: Eric Stoneking <[email protected]>

.github/workflows/docker-push.yml

@@ -0,0 +1,25 @@
+name: Docker Push CI
+
+on:
+  push:
+    branches:
+      - "master"
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_PASSWORD }}
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          push: true
+          tags: sirromsystems/42:latest