integration-tests: Move some logic from 0001-basic to common

Signed-off-by: NNiels Thykier <niels@thykier.net>

integration-tests/common

@@ -22,3 +22,14 @@ assert-equal() {
     exit 1
   fi
 }
+
+fixture-package-dir() {
+    packages=${DAK_ROOT:?}/tests/fixtures/packages
+    echo "${packages}"
+}
+
+import-fixture-signing-key() {
+    packages=$(fixture-package-dir)
+    ln -sf ${packages:?}/gpg/pubring.gpg ${DAKBASE:?}/keyrings/upload-keyring.gpg
+    dak import-keyring -U "%s" ${DAKBASE}/keyrings/upload-keyring.gpg
+}

integration-tests/tests/0001-basic

@@ -59,9 +59,9 @@ EOF
 )
 
 (
-  packages=${DAK_ROOT:?}/tests/fixtures/packages
-  ln -sf ${packages:?}/gpg/pubring.gpg ${DAKBASE:?}/keyrings/upload-keyring.gpg
-  dak import-keyring -U "%s" ${DAKBASE}/keyrings/upload-keyring.gpg
+  packages=$(fixture-package-dir)
+  import-fixture-signing-key
+
   cp ${packages:?}/nonfree-package_* ${packages:?}/package_* ${DAKBASE}/tmp
 
   dak process-upload -d ${DAKBASE}/tmp --automatic