Migrate to nix flakes

cabal.project

@@ -1,9 +1,9 @@
--- Bump this if you need newer packages
+-- Bump this if you need newer packages from Hackage
 index-state: 2022-10-29T00:00:00Z
 
-packages: marlowe-playground-server
-          marlowe-contracts
+packages: marlowe-contracts
           marlowe-symbolic
+          marlowe-playground-server
 
 -- We never, ever, want this.
 write-ghc-environment-files: never
@@ -19,9 +19,6 @@ constraints:
      -- TODO: Try to remove on next `cardano-node` version upgrade.
      hedgehog >= 1.0.2 && < 1.1
 
-constraints:
-     cardano-crypto-class -secp256k1-support
-
 -- The only sensible test display option.
 test-show-details: streaming
 
@@ -35,7 +32,6 @@ allow-newer:
 --   optimization: False
 -- package marlowe-cli
 --   optimization: False
-
 -- Copied from plutus-apps.
 package cardano-ledger-alonzo
   optimization: False
@@ -60,11 +56,13 @@ source-repository-package
   type: git
   location: https://github.com/input-output-hk/marlowe-cardano
   tag: d1ed1b9703f414ec1d1a29f6d4f5c58d2faf6c81
+  --sha256: sha256-unCGFcHDDgizFwiIMe8J+p84uufX56uulvvCITh5KSg=
   subdir:
     marlowe
     marlowe-actus
     libs/base16-aeson
 
+
 -- marlowe-cardano specific dependencies:
 
 -- on branch: next-node
@@ -323,13 +321,14 @@ source-repository-package
   type: git
   location: https://github.com/input-output-hk/cardano-addresses
   tag: 5094fb9d304ed69adedc99513634a00cbf850fca
-  --sha256: 10yj47gay72kx6v564qlfiigggcpqfdzrg61ii8p25m5n8ijz045
+  --sha256: sha256-m8oidcV9LWU0S+NBw4wH1JdKZVict1EbKBZ6kfdEEf4=
   subdir: command-line
           core
 
 source-repository-package
   type: git
   location: https://github.com/input-output-hk/cardano-wallet
+  --sha256: sha256-3oeHsrAhDSSKBSzpGIAqmOcFmBdAJ5FR02UXPLb/Yz0=
   tag: f6d4db733c4e47ee11683c343b440552f59beff7
   subdir:
     lib/cli
@@ -342,3 +341,10 @@ source-repository-package
     lib/strict-non-empty-containers
     lib/test-utils
     lib/text-class
+
+-- Upgrading this breaks purescript bridges.
+source-repository-package
+  type: git
+  location: https://github.com/input-output-hk/servant-purescript
+  tag: 002e172173ad2f2f69f98a3b56b7312364f23afe
+  --sha256: sha256-trTSChCACAnKpAaUznWuSNJJLpU8W4rJKHaZvHq5G50=