fix or exclude failing CI actions

Due to https://github.com/open-quantum-safe/liboqs-rust/issues/202 it is not
yet possible to build the static Rosenpass version for `i686`. The CI actions
which fail for this reason have been excluded for now. Further on, some
the workflow names have been shortened for better overview.

.github/workflows/nix.yaml

@@ -1,4 +1,4 @@
-name: Nix Related Actions
+name: Nix
 permissions:
   contents: write
 on:
@@ -26,6 +26,19 @@ jobs:
           - rosenpass-static-oci-image
           - proof-proverif
           - whitepaper
+        exclude:
+          # these do not exist
+          - nix-system: i686-linux
+            derivation: proof-proverif
+          - nix-system: i686-linux
+            derivation: whitepaper
+
+          # these fail currently
+          # TODO enable once https://github.com/open-quantum-safe/liboqs-rust/issues/202 is fixed
+          - nix-system: i686-linux
+            derivation: rosenpass-static
+          - nix-system: i686-linux
+            derivation: rosenpass-static-oci-image
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/qc.yaml

@@ -1,4 +1,4 @@
-name: Quality Control
+name: QC
 on:
   pull_request:
   push:

.github/workflows/release.yaml

@@ -16,7 +16,6 @@ jobs:
       matrix:
         nix-system:
           - x86_64-linux
-          - i686-linux
           - aarch64-linux
     steps:
       - uses: actions/checkout@v3