github: install pinned osbuild commit for unit tests

Run the setup-osbuild-repo script before running unit tests in github
actions to get the pinned osbuild-depsolve-dnf rpm.

Some steps had to be reordered for this.  The repo setup requires the
repository to be checked out and the dependency installation should
happen after the osbuild repo setup.

.github/workflows/tests.yml

@@ -20,17 +20,20 @@ jobs:
       image: registry.fedoraproject.org/fedora:latest
 
     steps:
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+
+      - name: Set up repository for pinned osbuild commit
+        run: ./test/scripts/setup-osbuild-repo
+
         # krb5-devel is needed to test internal/upload/koji package
         # gcc is needed to build the mock depsolver binary for the unit tests
         # gpgme-devel is needed for container upload dependencies
       - name: Install build and test dependencies
         run: dnf -y install krb5-devel gcc git-core go gpgme-devel osbuild-depsolve-dnf btrfs-progs-devel device-mapper-devel
 
-      - name: Check out code into the Go module directory
-        uses: actions/checkout@v4
-        with:
-          ref: ${{ github.event.pull_request.head.sha }}
-
       - name: Mark the working directory as safe for git
         run: git config --global --add safe.directory "$(pwd)"
 
@@ -55,14 +58,17 @@ jobs:
       - name: Enable crb repo
         run: dnf config-manager --set-enabled crb
 
-      - name: Install build and test dependencies
-        run: dnf -y install krb5-devel gcc git-core go gpgme-devel osbuild-depsolve-dnf device-mapper-devel
-
       - name: Check out code into the Go module directory
         uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
 
+      - name: Set up repository for pinned osbuild commit
+        run: ./test/scripts/setup-osbuild-repo
+
+      - name: Install build and test dependencies
+        run: dnf -y install krb5-devel gcc git-core go gpgme-devel osbuild-depsolve-dnf device-mapper-devel
+
       - name: Mark the working directory as safe for git
         run: git config --global --add safe.directory "$(pwd)"
 
@@ -87,14 +93,19 @@ jobs:
       - name: Enable powertools repo
         run: dnf config-manager --set-enabled powertools
 
-      - name: Install build and test dependencies
-        run: dnf -y install krb5-devel gcc git-core go gpgme-devel osbuild-depsolve-dnf device-mapper-devel
-
       - name: Check out code into the Go module directory
         uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha }}
 
+      - name: Set up repository for pinned osbuild commit
+        run: |
+          dnf -y install python3
+          ./test/scripts/setup-osbuild-repo
+
+      - name: Install build and test dependencies
+        run: dnf -y install krb5-devel gcc git-core go gpgme-devel osbuild-depsolve-dnf device-mapper-devel
+
       - name: Mark the working directory as safe for git
         run: git config --global --add safe.directory "$(pwd)"