chore(ci): Cache integration test image

.github/workflows/act_build.yml

@@ -31,9 +31,7 @@ jobs:
         target:
           - aarch64-unknown-linux-gnu
           - aarch64-unknown-linux-musl
-          - armv7-unknown-linux-gnueabihf
           - armv7-unknown-linux-musleabihf
-          - i686-unknown-linux-gnu
           - i686-unknown-linux-musl
           - x86_64-unknown-linux-gnu
           - x86_64-unknown-linux-musl
@@ -172,6 +170,26 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y podman
           podman --version
+      - name: Cache podman image
+        id: cache-podman
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/podman_cache
+          key: integration_tests-${{ runner.os }}-${{ hashFiles('integration_tests/images/arch/Containerfile') }}
+      - name: Load cached image
+        if: steps.cache-podman.outputs.cache-hit == 'true'
+        run: |-
+          set +ex
+          podman load < ~/podman_cache/test_img.tar
+      - name: Build & cache image
+        if: steps.cache-podman.outputs.cache-hit != 'true'
+        run: |-
+          set +ex
+          cd integration_tests/images/arch
+          ./build_image.sh
+          mkdir -p ~/podman_cache
+          podman save localhost/test_img > ~/podman_cache/test_img.tar
       - name: Run integration tests
         run: |-
           cd integration_tests

integration_tests/images/arch/Containerfile

@@ -1,4 +1,4 @@
-FROM docker.io/archlinux/archlinux:base-devel-20250302.0.316047 AS base_image
+FROM ghcr.io/archlinux/archlinux:base-devel-20250302.0.316047 AS base_image
 
 # Signatures expire, repos expire, and so on. Make this image reproducible
 # (update this once in a while)